Showing papers on "Genus published in 1976"

Study of genetic relationships among marine species of the genera Beneckea and Photobacterium by means of in vitro DNA/DNA hybridization.

Abstract: Strains representative of species of the marine genera Beneckea and Photobacterium were used as reference standards in in vitro DNA/DNA competition experiments. Within a given species, strains were found to be related by over 80% competition. (Competition was defined as the amount of radioactive DNA displaced by heterologous DNA relative to the amount displaced by homologous DNA.) On the basis of interspecies competition values (expressed as averages), the following groupings could be made: 1. "Photobacterium" fischeri was related to strain ATCC 15382 by a competition of 38% and was distinct from all the other strains tested (competition less than or equal to 11%). 2. The genus Photobacterium consisted of 3 species, P.phosphoreum, P.leiognathi, and a newly designated species, P.angustum (composed of non-luminous strains). The latter species was found to be related to P.leiognathi and P.phosphoreum by 56 and 28% competition, respectively, while P.phosphoreum was related to P.leiognathi by 29%. 3. In the genus Beneckea, 65% competition was detected between B.harveyi and B.campbellii as well as between B.parahaemolytica and B.alginolytica. These pairs of species were related to each other by 51-58% and to B.natriegens by 34-56% competition. A newly designated pathogenic species, B.vulnifica, appeared to have a low but significant relationship to all the above mentioned species of Beneckea. 4. Two biotypes, related by 68% competition, were recognized in the species B.splendida. Similarly, B.pelagia was found to consist of 2 biotypes related by a competition of 67%. The competition values between these species were 38-40%. 5. B.nereida, B.nigrapulchrituda, and "Vibrio" anguillarum had competition values less than or equal to 30% to each other as well as to other species of Beneckea. 6. With Vibrio cholerae as the reference standard, V.albensis was found to be related by a competition of 82%, while V.proteus and V.metschnikovii had competition values of 22 and 12%, respectively. These results suggested that V.albensis should be synonymized with V.cholerae, while the latter two organisms should remain distinct from this species. V.cholerae as well as the other terrestrial organisms tested did not appear to be significantly related to any of the marine strains (competition values less than or equal to 27%). The speciation derived from the results of the DNA/DNA competition experiments was compared to previous speciation based on phenotypic similarities.

The fossil pollen genus Classopollis

Abstract: The generic name Classopollis Pflug, 1953, is considered as a valid usable name for Mesozoic spherical pollen characterized by a subequatorial circumpolar canal, a thickened equatorial band, a distal cryptopore, and a proximal tetrad scar. A study of Classopollis exine revealed the absence of nexine. Classopollis has a worldwide distribution in Upper Triassic-Turonian strata. Plants producing Classopollis have affinity with araucarian and/or gnetalean conifers. They occupied well-drained soils of upland slopes and lowlands near coastal areas, preferring the warm climate of transgressive seas.

Comparison of chloroplast DNAs by specific fragmentation with EcoRI endonuclease

Abstract: A technique has been developed whereby chloroplast DNA can be digested with EcoRI endonuclease without prior isolation of the DNA from the organelle. The specific fragmentation patterns produced show that chloroplast DNAs from different families or genera of plants have few if any bands in common, and it is not until comparisons are made between species of the same genus that similarities become apparent. The number of bands in common between species varies considerably from genus to genus and the degree of similarity of chloroplast DNAs may be correlated with how closely related the species are as judged by their ability to form viable hybrids.

A Monograph of the Lichen Genus Pseudoparmelia Lynge (Parmeliaceae)

Abstract: Hale, Mason E., J r . A Alonograpli of the Lichen Genus Pse~idopai~melia Lynge (Parmeliaceae). Smi fhsonian Contl-ibzitions to Botany, number 31, 62 pages, 18 figures, 197(i.--A ~vorld monograph ot“ the genus Pseiidopai-melia is presented. The re are 76 species, most occurring in dry subtemperate to tropical areas and especially concentrated in the arid scrub lands of South Africa, Australia, and Brazil. T h e genus is characterized 13) a n unusually high number of species with di1,aricatic acid and related orcinol depsitles. T h e following new species are described: P. callicliroa KnrokaMa, P. concornitnns Hale, P. conlabiosa Hale, P. dahlii Hale, P. ncoquintal-ia Hale, P. siibarnbigzia Hale, P. .subamplexa Hale, and P. ixnczolnnu Hale. T h e following new combinations are made: P. L‘OV rugati-im (Kurokawa and Filson) Hale, P. c x o m n t a (Zahlbruckner) Hale, P. geilachci (Zahlbruckner) Hale, P. papillo.sa (Lynge ex Gyelnik) Hale, P. Totlrigiiesiana (Hue) H:ile, P. scliistncca (Kurokawa arid Filson) Hale, P. scotop l iy l la (Kurokawa) Hale, and P. spodochroa (Kui-okaxva and Filson) Hale. OFFICIAL l’IBL.ICATIO\ 1)Ai I: is hantlstampetl i n a lilnitetl tiutiihcr of initi;tl copies and is recorded in rhc Institution’s annual report. Snzitiisoizicin l’cnr. SLKIFS co\ ER D E S I G ~ : Leaf clearing from thc Katsnra trce Cei .c id iphy l lu in jnfmnicuin Siebold and Zuccarini. Library of Congress Cataloging in Publication Da ta Hale, hlason E. .4 monograph of the lichen genus Pseudopar??~c lk~ Llnge (Parmeliaceae) (Smithsonian Contributions to botany ; no. 31) 15ibliography: p . Includes index Supt. of Docs. no.: SI 1.29:31 I . Pseudoparmclia. I . Title. 11. Series: Sn1itl1sonian Institution. Smithsonian contributions to botzGi) , no. 31. Q K l S 2 7 4 7 no. 31 [Qh585.P2] 381’.08s [389’.1] 73-619375

Spider mites of Mexico (Acari: Tetranychidae)

Abstract: Twenty-eight genera and 143 species of the plant feeding mites from Mexico are recognized; many of these are found in the United States and Central and South America. A new genus Sonotetranychus is described for Anatetranychus daleae Tuttle, Baker and Abbatiello, and A. albiflorae Tuttle, Baker and Abbatiello. Twenty-six new species are described: Monoceronychus erythrinae, M. littoralis, M. pachucensis, Langella ambrosiae, Eotetranychus guaymas, E. neolewisi, E. zexmlniae, E. euphorbiae, E. deleoni, E. hameliae, E. zempoalensis, E. salviae, E. typhae, Mononychellus chapalensis, M. eysenhardtiae, M. willardiae, Platytetranychus pueblensis, Schizotetranychus prosopis, Oligonychus (Wainsteiniella) pini, W. (W.) juniperi, O. (Homonychus) perseae, O. (Pritchardinychus) tlaxcensis, O. (P.) daleae, O. (P.) quercus, Tetranychus (Tetranychus) eharai and T. (Polynychus) neopolys . Keys to the genera and species are given, and all species are figured.

Some functional and adaptive aspects of vessel member morphology

Abstract: The hypothesis of functionally adaptive diversification of wood structure in the course of evolution as advanced by Carlquist is critically tested for vessel member length and type of perforation plate. The functional significance of within-tree variation in vessel member morphology is discussed first, and a criticism of Philipson & Butterfield’s theory for explaining classical length-on-age curves for fusiform initial length is given. At the genus and family level examples are cited which contradict the hypothesis that specialization of the perforation plate has a strong selective advantage for the occupation of more xeric environments or for high conductive rates. Other examples, however, seem to support this. The functional interpretation of correlations between vessel member length and ecological conditions is criticised. A comparison is made between whole woody floras or vegetation types with respect to the proportion of genera with scalariform perforation plates (Tables 1 and 2, Fig. 2). In tropical lowland rain forests the percentage of genera with scalariform plates is rather low. It strongly increases for tropical montane forests and for temperate to arctic floras. It is lowest in seasonally dry to arid regions. These trends support Carlquist’s idea that scalariform plates are, in general, only successful for conditions which require low rates of water conduction. In addition, the role of temperature is stressed. The total evidence presented in this paper is discussed in terms of random ‘patio ludens’ evolution which has to a considerable extent been canalized through selective pressures by environmental factors.

Drosophilidae of Australia. I. Drosophila (Insecta : Diptera)

Abstract: The Australian members of the genus Drosophila are reviewed, with redescriptions of many species; 40 new species are also described, bringing the known total to 81. A key to species is provided. The Australian Drosophila fauna is dominated by members of the subgenus Scaptodrosophila, most of which appear to be endemic. The bulk of the Australian Drosophila fauna is substantially different from that of neighbouring New Guinea-south-east Asia, but the latter fauna overlaps into northern Queensland. The Australian fauna includes eight cosmopolitan species.

Studies on southern Australian taxa of Solieriaceae, Rhobdoniaceae and Rhodophyllidaceae (Rhodophyta)

Abstract: The morphology, reproduction, and relationships of the southern Australian species of three closely related families of the Gigartinales (Solieriaceae, Rhabdoniaceae and Rhodophyllidaceae) are described. In the multiaxial Solieriaceae, most genera of which are non-Australian, Solieria robusta (Greville) Kylin and five species of Callophycus Trevisan have been studied. Apart from Sarconema filiforme (Sonder) Kylin, these are the only southern Australian taxa retained in the family. In the uniaxial and non-procarpic Rhabdoniaceae, Rhabdonia Hooker and Harvey (three species), Catenella nipae Zanardini, Areschougia Harvey (three species), and Erythroclonium Sonder (four species) have been studied. A species previously placed in Areschougia, A. dumosa Harvey, is found to be procarpic and is described as a new genus, Melanema. In all other vegetative and reproductive features it is similar to Areschougia, and it is provisionally retained in the Rhabdoniaceae. In the uniaxial and procarpic Rhodophyllidaceae the following are studied: Rhodophyllis Kuetzing (four species), Craspedocarpus Schmitz (four species, previously placed in Rhodophyllis), Gloiophyllis barkeriae (Harvey) J . Agardh, Calliblepharis planicaulis (Harvey) Kylin, and a new genus Austroclonium, based on Rhabdonia charoides Harvey.The main features used by Kylin in separating and characterizing these families and genera are considered generally satisfactory, but there appear to be cases where they cannot be rigidly applied. Such cases include the direction of gonimoblast development, and in the case of Melanema it is suggested that procarpy has arisen, by loss of ability to form connecting filament, from a non- procarpic ancestor such as Areschougia.

A monograph of the lichen genus Bulbothrix Hale (Parmeliaceae)

Abstract: Hale, Mason E., Jr. A Monograph of the Lichen Genus Bulbothrix Hale (Parmeliaceae). Smithsoniun Contributions to Botany, number 32, 29 pages, 7 figures, 1976.-A world-level revision is given for the 29 species of Bulbothrix, a generic segregate of Parmelia characterized by marginal bulbate cilia and production of atranorin in the upper cortex. The genus is primarily tropical in distribution and best developed in secondary forests. The main center of speciation is Brazil with 14 species, and the genus is also well represented in Africa. The New World species have a high frequency of depsides and orcinol depsidones, whereas the Old World species usually contain p-orcinol depsidones. One new species, B. klementii Hale, and one new combination, B. goebelii (Zenker) Hale, are proposed. OFFICIAL I ~ ~ ' I ~ C , I C , ~ T I O S D.yrI: is handstamped in a limited number of initial copics and is rccordetl in thc Institution's annual rcport, Suiithsoninn Y e w . SI:RII:S COVER DMICS: Leaf clcaring from the katsura trcc Cercid iphy l l i rm j npon icum Siebold and Zuccaritii. Libra1 y of Congrcss Cataloging in Publication Data Hale, Mason E. A monograph of the lichcn gcnus Bulbothrix Halc (Parmcliaccac). (Smithsonian contributions to botany : no. 32) Bibliography: p. Includes index. Supt. of Docs. no.: SI 1.29:32 1 . Bulbothrix. I . Titlc. 11. Series: Smithsonian Institution. Smithsonian contributions to botany ; no. 32. QKlS2747 110. 32 [QK589.P2] 581'.08~ [589'.1] 75-619423

Brochothrix, a New Genus Tentatively Placed in the Family Lactobacillaceae

Abstract: Microbacterium thermosphactum McLean and Sulzbacher differs to such an extent from the type species of Microbacterium, M. lacticum Orla-Jensen, that it cannot be retained in this genus. Recent studies have shown that M. thermosphactum strains form a distinct taxon worthy of genus status. A new genus, Brochothrix, is established for the species B. thermosphacta (McLean and Sulzbacher) comb. nov. This genus is tentatively placed in the family Lactobacillaceae. B. thermosphacta is the type species of the genus, and ATCC 11509 is designated to be the type strain of B. thermosphacta.

Generic and Sectional Delimitation in Onagraceae, Tribe Epilobieae

Abstract: The available evidence is used to produce a revised taxonomy for Onagraceae tribe Epilobieae, with two genera, Epilobium and Boisduvalia. Zauschneria is a specialized, bird-pollinated taxon closely related to one group of Epilobium, and it is consequently reduced to the status of a section of that genus. It is treated as comprising a single species with three tetraploid (n = 15) and three octoploid (n = 30) subspecies, between which extensive intergradation occurs. Chamerion (Chamaenerion), a Eurasian group of seven species, two reaching North America, is closely related to and doubtless shares a common ancestor with Epilobium sect. Epilobium; the other four sections are more distantly related. They include a total of seven species, all xerophytes confined to western North America, the probable place of origin of the tribe. Boisduvalia is treated as comprising two sections in place of the three recognized earlier, based upon further morphological studies and evidence obtained from artificial hybridization. The taxonomy proposed for the tribe Epilobieae appears to provide a balanced classification for the group that brings it into line with the other five tribes and 15 genera of the family. The tribe Epilobieae, with some 210 species, differs from the other five tribes in the family Onagraceae (Raven, 1964b) in its dotlike, almost entirely heteropycnotic chromosomes that persist as chromatic dots through interphase (Kurabayashi et al., 1962); basic chromosome numbers x = 9, 10, 12, 13, 15, 16, and 18; occurrence of many species in moist places; and, in all but a few species, the habit of shedding the mature pollen as tetrads. It may be related to the less specialized group Jussiaeeae, consisting of the genus Ludwigia (including Jussiaea and Isnardia), which resembles it in having dotlike, heteropycnotic chromosomes; in growing in moist places; and, in many species, in shedding its mature pollen in tetrads. The basic chromosome number of Ludwigia, however, is x 8; its tetrads are made up of pollen grains that differ greatly from those of Epilobieae and have probably evolved independently (Skvarla et al., 1975); and it lacks interxylary phloem, present in Epilobieae (Carlquist, 1975). Ludwigia seems to be a relatively generalized genus within the family, resembling Fuchsia in its retention of primitive characteristics, as inferred by Eyde & Morgan (1973), and it probably is not directly related to Epilobieae, which then appear as a rather isolated group within the family. Although the fossil record is badly in need of reevaluation, Epilobieae probably extend back to Paleogene time (see discussion in Eyde & Morgan, 1973: 785). Within this tribe, the genera are closely related to one another. This paper is directed to the following question: how many genera and sections, in the sense of Lewis & Lewis (1955) and Raven (e.g., 1963, 1969), is it useful to recognize? Boisduvalia (Raven & Moore, 1965) includes six species of annual plants of western North and South America. Collectively, they are distinguished from 1 I am grateful to the U. S. National Science Foundation for a series of grants in support of my study of Onagraceae, to Steven R. Seavey for useful comments on this paper, and to G. Perraudin for advice on the progress of his hybridization experiments. 2 Missouri Botanical Garden, 2345 Tower Grove Avenue, St. Louis, Missouri 63110. ANN. MissouRI BOT. GARD. 63: 326-340. 1976. This content downloaded from 157.55.39.104 on Mon, 20 Jun 2016 05:38:00 UTC All use subject to http://about.jstor.org/terms 1976] RAVEN--EPILOBIEAE 327 Epilobium by their annual habit and lack of a coma, the tuft of long trichomes at the chalazal end of the seed that aids in dispersal. No species of Epilobium is both annual and lacks a coma, and no species is transitional between these two genera. In aspect, Boisduvalia is sharply distinct from Epilobium. Plants of Boisduvalia germinate in moist conditions, often actually submerged, and initially produce large, glabrous, opposite leaves similar to those of Epilobium. Later, they begin to produce alternate, sometimes densely pubescent, hard leaves, and when they produce flowers and fruits, they are often growing under decidedly xeric conditions. Boisduvalia includes two species with a gametic chromosome number of n = 10, one with n = 9, one with n = 19, and two with n = 15. The last is the only one of these chromosome numbers that also occurs in Epilobium; but, as we shall see, the species of these two genera with n= 15 seem to be unrelated. As to the remainder of the tribe, the bird-pollinated, orange-red-flowered Zauschneria, comprising a single polytypic species of western North America, has been recognized as distinct since it was described by Presl in 1831. As early as 1806, Salisbury (1806: pl. 58), in describing Chamaenerium halimifolium, used the existence of Zauschneria, known to him from plants gathered by Archibald Menzies along the coast of northern California, as an argument for recognizing Chamaenerion as a genus distinct from Epilobium. Zauschneria was obviously generically distinct, yet had the coma of Epilobium: why not Chamaenerion also? In fact, Zauschneria is more closely related to Epilobium sect. Cordylophorum, which I shall discuss below, than to Epilobium s. str. All species of both groups have a gametic chromosome number of x = 15, unique in Epilobium (Lewis & Raven, 1961); most have a relatively long floral tube; and all grow in xeric sites and are somewhat woody at the base. Their wood anatomy (Carlquist, 1975) is virtually identical. The single species of Zauschneria (see p. 335) shares with Epilobium nevadense and E. nivium a characteristic unusual for the tribe: a prominent apiculus of brown oil cells at the tip of each leaf (Brandegee, 1892; Stein, 1915; Munz, 1929; Raven, 1962a). Their seeds, like those of Epilobium sect. Xerolobium (comprising one highly polymorphic xerophytic annual species), are large, obovoid to clavate, and prominently constricted at the micropylar end (Seavey, Magill & Raven, 1977). Furthermore, Zauschneria, like Boisduvalia and the two sections of Epilobium just mentioned, as well as a third, Epilobium sect. Crossostigma, has large endexine channels in the distal pollen walls, which are therefore different from all other pollen walls in the family Onagraceae and a clear indication of relationship (Skvarla et al., 1976). The viscin threads in their pollen are thick and fluted (incised compound), unlike the less sharply ridged, tightly compound ones of sects. Chamaenerion and Epilobium (Skvarla et al., 1977). Zauschneria differs from the three species of Epilobium sect. Cordylophorum only in its longer floral tubes, orange-red flowers, and possession of a scale at the base of each stamen within the narrow part of the floral tube. These scales are highly variable and sometimes reduced to an irregular line (Curran, 1888). They appear to be homologous with the ring inside the floral tube in Boisduvalia (Curran, 1888: 255; Raven & Moore, 1965: 239, figs. This content downloaded from 157.55.39.104 on Mon, 20 Jun 2016 05:38:00 UTC All use subject to http://about.jstor.org/terms 328 ANNALS OF THE MISSOURI BOTANICAL GARDEN [VOL. 63 2-4) and in many species of Epilobium, such as E. obcordlatum A. Gray. In the hummingbird-pollinated flowers of Zauschneria, this ring has apparently been somewhat elaborated during the course of evolution in relation to the protection of the abundant nectar from potential nectar thieves of low energetic requirements (Heinrich & Raven, 1972). Zauschneria is pollinated by hummingbirds and separated by the syndrome of characteristics typical of bird pollination from its bee-pollinated relatives, but overwhelmingly similar to them in all other re-

A revision of ths Scarabaeine dung beetles of Australia. III. Tribe Coprini

Abstract: This third part of a revision of the Scarabaeinae covers the tribe Coprini, which in Australia is represented by the subtribes Dichotomina and Coprina. Three genera and 26 species are described and keyed. One genus and 13 species are described as new, while one generic and three specific names are synonymized. The new generic name is Notopedaria, to receive the Australian species formerly in the African genus Pedaria. The new specific names are Notopedaria occidentalis, N. tropicalis, N. sylvestris, N. eungella, N. scarpensis, N. pratensis and N. tuberculata; Thyregis relictus and T. monteithi; and Coptodactyla brooksi, C. rneridionalis and C. torresica. An eighth new species of Notopedaria, storeyi, is described in an appendix to the work. The new synonymies are Arrowianella Paulian, 1933 = Thyregis Blackburn, 1904; Arrowianella pauliani Frey, 1970 = Thyregis kershawi Blackburn, 1904; Coptodactyla nitida Paulian, 1933 = subaenea Harold, 1877; and C. imitatrix Balthasar, 1965 = C. depressa Paulian, 1933. No behavioural observations have been made on the Australian Coprini. Some notes are presented on biogeography and evolutionary trends in the group. * Part II (Tribe Scarabaeini), Aust. J. Zool., Suppl. Ser., 1974, No. 24.

Transfer of the tarsocheylidae to the heterostigmata, and reassignment of the tarsonemina and heterostigmata to lower hierarchic status in the prostigmata (acari)

Abstract: The systematic status of the genus Tarsocheylus Berlese, 1904 and the position of the family Tarsocheylidae Atyeo and Baker, 1964 in the Prostigmata is reviewed. The family does not belong in either the Raphignathoidea or the Anystoidea but in its own superfamily, the Tarsocheyloidea, which is described for this purpose. In turn, this superfamily is placed alongside the Heterocheyloidea in the Heterostigmata.Because the type-species of Tarsocheylus, T. paradoxus Berlese, 1904, is conspecific with Hoplocheylus discalis Atyeo and Baker, 1964 (new synonymy), the concept of Hoplocheylus Atyeo and Baker, 1964, which has remained until now as originally proposed, is the same as that of Tarsocheylus. However, a new case is made for recognizing these genera as mutually distinct, based on other morphological criteria. Tarsocheylus atomarius Berlese, 1913, the type-species of Hoplocheylus, is apparently conspecific with Hoplocheylus canadensis Marshall, 1966 (new synonymy) and perhaps with one or two other described species from North America. A third generic entity, represented by Hoplocheylus johnstoni Atyeo and Baker, 1964, is noted but not named or formally described. Hoplocheylus pickardi Smiley and Moser, 1968 is conspecific with H. similis Delfinado and Baker, 1974 (new synonymy).Hemitarsocheylus Soliman and Zaher, 1975, which was described as a new genus in the Tarsocheylidae, is congeneric with Stigmocheylus Berlese, 1910 (new synonymy). This genus does not belong in the Tarsocheyloidea, but rather in the Anystoidea.A list of character states found useful in recognizing groupings of species of Tarsocheylidae is presented. Based on the collection data with specimens representing described and undescribed species at hand, the known distribution of the Tarsocheylidae is extended to include Australia and western North America, and the second known instance of an association with passalid beetles is recorded.From a phylogenetic standpoint, the Tarsocheyloidea and Heterocheyloidea are proposed as sister groups that together constitute a new suprafamilial taxon, the Tarsocheylina. In turn, the Tarsocheylina and Tarsonemina are proposed as sister groups, and both are described; together, they form the Heterostigmata.The systematic and phylogenetic relationships of the Heterostigmata (including the Tarsonemina) to the Prostigmata and the Astigmata are reviewed. Not only should the Heterostigmata be retained in the Prostigmata but it should be lowered in hierarchic rank, such that it is a part of the Eleutherengona. The stock that gave rise to the Anystoidea and related superfamilies is shown to be ancestral to the Heterostigmata as well.

A Revision of the Genus Strategus (Coleoptera: Scarabaeidae)

Abstract: A Revision of the Genus Strategus (Coleoptera" Scarabaeidae)

Brain-Body Weight Relationships in Selachii

Abstract: on Pacific relatives. Proc. Acad. Nat. Sci. Philad. 120:45-174. BUEN, F. DE. 1963. Peces Chilenos: Beloniformes, Syngnathiformes y Gobiidae. Bol. Soc. Biol. Concepcion (1960-1961). 35-36:81-102. GINSBURG, I. 1933a. Descriptions of new and imperfectly known species and genera of gobioid and pleuronectid fishes in the United States National Museum. Proc. U. S. Nat. Mus. 82(2961):1-23. 1933b. A revision of the genus Gobiosoma (family Gobiidae) with an account of the genus Garmannia. Bull. Bingham Oceanogr. Coll. 4(5): 1-59.

The Genus Porphyra C. Ag. (Rhodophyta-Bangiales) in the American South Atlantic. II. Uruguayan Species

Abstract: The study of abundant material of the genusPorphyra from the Uruguayan coast showed that none of the three species of Porphyra pieviously mentioned in the literature (P. kunthiana, P. kunthii and P. minor) could be recogniscd and that the present species aie: P. leucosticta Thuret, P. pufalsu and P. rizzinii, the last two are proposed here äs new species. All are monoecious; P, pujalsii presents marginal teeth, being the second species with that character to be described to the American Atlantic Ocean;?. rizzinii differs from P. leucosticta mainly in the disposition of the carpospores and spermatia among other differences. The paper presents a thorough discussion of the new taxa proposed and numerous ülustrations of the distinctive features.

Studies in resupinate Basidiomycetes — IV

Abstract: A new genus (Mycostigma) is established for Corticium aegeritoides Bourd. & Galz. Trechispora spinulifera and Tulasnella pallidocremea are described as new species. Two new combinations are made.