Showing papers in "Botanical Journal of the Linnean Society in 1981"

TL;DR: Petal structure and the distribution of pigments in petals were studied in relation to the functional anatomy of petals and the ways in which petals absorb and reflect light.

TL;DR: The systematics of the Eustigmatophyceae are revised at the level of species, genus, family and order and Tribophycesae, based on Tribonema, is published as the typified name for the class previously called Xanthophycee.

TL;DR: The species of Gnaphalium, Helichrysum and related genera in southern Africa have been surveyed and a number of groups of allied species detected in which the ratio of female to hermaphrodite flowers was detected.

TL;DR: Fossil leaves and bracteate fruits were described from a new Upper Palaeocene locality in the Reading Beds near Newbury, southern England as mentioned in this paper, and the leaves were assigned to Craspedodromophyllum acutum Crane a.

TL;DR: Reports on 267 chromosomes counts are presented from material of known wild origin referable to 128 taxa of Compositae native to North America, or aliens growing there in a wild state.

TL;DR: The literature on terminology of stomata and stomatal development is reviewed and the terminology rationalized and the classification of developmental types and of the developing cells should not be combined with the morphological classification of mature stomatic complexes.

TL;DR: Dry weathered wood (lignum and arid bark) support a discomycete flora which is taxonomically extremely diverse and contains a high percentage of species with characters not found in DisComycetes of more mesic habitats.

TL;DR: Pollen morphology and exine stratification are found to be useful in clarifying the relationships between the genera and subtribes and the palynological studies support the most recent proposals concerning the classification of the Hyoseridinae.

TL;DR: A comparative account is given of transfusion tissue in 82 species and the phylogenetic relationships of various taxa of gymnosperms is discussed on the basis of these different kinds of transfusions tissue.

TL;DR: Analysis of pollen loads from the corbiculae of H. bakeri suggests that individual bees may specialize temporally on different floral forms, but the apparent preferential collection of pollen probably results from spatial segregation of morphs and the localized foraging behaviour of bees rather than preference on the part of individual bees for particular stylar forms.

TL;DR: Flowers of 34 species, representing 4 of the 6 genera of the morphologically diverse South American subtribe Hyptidinae and including members of many of the sections of the genus Hyptis are investigated, finding that floral anatomy is basically uniform, with some minor variations which are mainly related to differences in flower size.

TL;DR: The discovery is reported of a new endemic species of wild rice from northern Australia, Oryza meridionalis Ng, which is reproductively isolated from all other species of the series Sativae.

TL;DR: The mating system and the profound capacity of the species for vegetative reproduction, coupled with the small size and geographical isolation of many populations, strongly support the hypothesis of individual homozygosity.

TL;DR: A detailed re-examination of the thecal plates of marine dinoflagellates belonging to the Diplopsalis group which have been collected in an extensive survey of the seas around the British Isles is made possible.

TL;DR: The genus Astrosphaeriella Sydow has been regarded as a synonym of Microthelia Kerber in recent surveys of bitunicate pyrenomycetes as mentioned in this paper.

TL;DR: Developmental studies reveal that initiation and differentiation of foliar primordia resembles that of other dicotyledons except that tannin cells and secretory ducts arise precociously.

TL;DR: The five species of Tradescantia section Cymbispatha studied, including one species T. poelliae D. R. Hunt, have chromosome numbers of In = 12, 14, 16, 22, 28, 30 and 36 and karyotypes of acrocentric, metacentric or telocentric chromosomes, or mixtures of both ac rocentric and metacentic chromosomes.

TL;DR: The botanical career of Nathaniel Wallich is followed; his collecting activities in Asia enumerated, and the final disposition of his huge herbarium, largely the property of the Honourable East India Company is given.

TL;DR: Differences in pollen structures of the species studied do not correspond to present taxonomic groupings, but support a current proposal to place some of thespecies in the genus Paracoffea Leroy.

TL;DR: The ovule primordium of Costus is trizonate and both its integuments are dermally initiated, which strongly suggests that most, if not all, monocotyledons have derMally initiated integuments, indicating a derived status.

TL;DR: Thirty-two differential characters are numerically analysed for the six existing taxa of the genus Vella L. and indicate that four distinct species, one (V. pseudocytisus L.) with three sub-species, should be distinguished.

TL;DR: All the names published under the genera Gnaphalium, Xeranthemum and Helichrysum in the period 17531800 are listed and up-to-date determinations are given as discussed by the authors.

TL;DR: Developmental morphology of two natural populations of Ceratophyllum inhabiting the waters of Delhi has been investigated under natural conditions and in aseptic culture and the two populations are assigned to two distinct species C. demersum L. and C. echinatum Gray.

TL;DR: The development of leaf stomata in species of Orchidoideae sensu Garay is agenous or hemimesogenous with a single mesogene cell and this kind of stomatal development in monocotyledons is documented by micrographs for the first time.

TL;DR: Fourteen Families, 21 genera and 23 species have been described in this work, as motifs identified on the ancient wooden carved and painted vases known as keros, dating from the early colonial or transitional epoch between the pre-conquest Inca styles and those coming later with very strong Spanish influence.

TL;DR: The central Australian flora currently contains 78 alien species, of which 17 are predominantly summer-growing, 19 are southern winter-growing species reaching roadsides, stockyards and watercourses in the southern Northern Territory and 42 are at present confined to gardens in Alice Springs.

TL;DR: A study has been made of five species of the genus Amaranthus which, though cosmopolitan, are predominantly tropical and have a relatively lower chiasma frequency compared with the wild species.

TL;DR: The Gynoecium of Wallacea has two epeltate carpels with a laminar placentation, the carpel margins being displaced on to the topographically ventral carpel surfaces with a row of ovules along each margin.

TL;DR: The existence of 2n = 22 in G. speciosa, combining both basic numbers at the amphidiploid level provides evidence of pairing between metacentrics and acrocentrics in such a way as to substantiate the view that fusion or fission of chromosomes is responsible for the modification of basic number.