Showing papers in "Botanical Journal of the Linnean Society in 1968"

TL;DR: An intensive study of the cytology and sexual behaviour of the classical Spartina x townsendii agg.

TL;DR: Morphological and genetic techniques are presented which may give an estimate of the frequency of intragametophytio selfing in nature and a genetic load was found in Onoclea sensibilis L. morphologically has a mating system which gives a low probability of intrusion.

TL;DR: A comparison with other Devonian and Carboniferous pteridophytes suggests that Rhacophyton is probably a primitive member of the Progymnospermopsida or immediately ancestral to that group.

TL;DR: Cuttings of Tamarix aphylla were grown in various concentrations of NaCl and many proplastids, vacuoles with simple structure and others with infolded membranes as well as numerous mitochondria were observed in the secretory cells, suggesting that pectic substances absorb solutions easily and may enhance the transport of salt.

TL;DR: Cyclostigma kiltorkense Haughton (Upper Devonian, Ireland) is preserved as a compression fossil in which the plant material has been replaced by chlorite, and Surprisingly fine detail is observable when the material is immersed in xylene.

TL;DR: The organic attachment of male and female cones to twigs previously described as Tomaxellia biforme Archangelsky is reported, and some morphological changes of the female cones, which probably took place during the Mesozoic (in these particular groups) are inferred.

TL;DR: By the end of the Early Cretaceous angiosperms were already distinguished by their high state of morphological development judging by leaf form and systematic composition, and were widely spread occurring in regions of both temperate and warm humid climates.

TL;DR: The structure of the utricle, a special envelope investing the oogonium, characteristic of the Mesozoic Charophyte family Clavatoraceae, is described in Perimneste horrida Harris and allied species and shows a three-rayed symmetry.

TL;DR: A reconstruction of Weichselia reticulata is presented, in which the pronounced dimorphism of the fronds raises problems which cannot be interpreted in terms of normal Recent xeromorphic ferns.

TL;DR: The chromosome numbers of nine species of the genus Spartina have been determined and their meiotio pairing has been examined and the basio chromosome number is deduced as being x= 10 for these speoies in contrast to former reports of x= 7.

TL;DR: The present evidence suggests that the herbaceous and arborescent ly copsids are taxonomically remote.

TL;DR: It is concluded that even OENTCLAS, used alone, could have greatly enhanced the taxonomic understanding of this well-known genus.

TL;DR: A male cone associated with Brachyphyllum expansum (Sternberg) is described from the Middle Jurassic of the Elburz Mountains in Northern Iran (Persia) and the genus of Masculostrobus Seward is emended to restrict its use for conifer male cones containing non-saccate pollen.

TL;DR: The biological and systematic significance of the described structures is discussed and the plant is interpreted as a Matoniaceous derivative showing xerophytic adaptations.

TL;DR: Together with other plant remains of Upper Liassic-Aalenian age there were found in Grojec near Krakow, Poland, seeds known from the Yorkshire Gristhorpe Bed as Allicospermum relemirum Harris, which showed in their pollen chamber and mieropyle, pollen of Eucommiidites troedssonii Erdtman which adds to similar evidence provided already.

TL;DR: The description of Williamsonia harrisiana sp.

TL;DR: The most likely ancestral form, on the basis of known Paleozoic fossil plants, are the pterido-sperms, which are likely to have had slender, elongated, branched stems, with numerous leaves.

TL;DR: Williamsonia nizhonia sp.

TL;DR: Four new species of conifer twigs are described from well-preserved compressions isolated from black shales found in Makhtesh Ramon, a large cirque in southern Israel, dated as Lower Jurassic.

TL;DR: The review summarizes the progress achieved in the revision of the Indian species of Commelinaceae and analyses how far the synthetic approach coupled with orthodox taxonomy has helped to clarify the many ambiguities prevalent in the family.

TL;DR: Some Bennettitean leaves from the Lias of Karmozd-Zirab, Northern Iran are described, describing some Ptilophyllum species from a rich assemblage of Jurassic plants, collected by the author in 1960 and 1961.

TL;DR: Since no significant differences were noticeable between the external form or cuticular structure of the fossil and living scales, Araucarites cutchensis Feistmantel has been renamed Araucaria cutchensi (Feistmantsel) comb.

TL;DR: Taxonomic and nomenclatural confusions encountered in a study of theBritish species of Cystoseira are discussed; a number of non-British species, problems of whose synonymy have become involved with those of the British species, are also included.

TL;DR: From the Upper Jurassic flora of Andoya, Northern Norway, which is now under revision, Pseudotorellia heeri sp.

TL;DR: Pseudotorellia comprises at present seven valid species from Spitzbergen, East Greenland, Sweden, Poland, and the U.S.R. (Kazakhstan, Uzbekistan and the Bureja basin in the Soviet Far East).

TL;DR: CUxthropteris meniscoides Brongn.

TL;DR: Transfers and macerations of Alethopteris ambigua Lesquereux reveal it as axeromorphio plant, where the papillose lower epidermis of each pinnule is sheltered by incurved pinnules margins, a bladelike extension of the midvein and by marginal hairs.