Results 141 to 150 of about 888 (173)
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Relationship between biomass and surface area of Charophyceae
Issues of modern algology (Вопросы современной альгологии), 2021Relationships between charophytes surface area and biomass were studied in oligo-mesotrophic Naroch Lake (Belarus). To determine the surface area of Charophytes the geometric similarity method was used, preceded by dividing the thallus into separate cylindrical fragments.
Tamara A. Makarevich, Natalia V. Boreiko
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Oospore Wall Ornamentation in the GenusTolypella(Charales, Charophyceae)
Journal of Phycology, 2012The ultrastructural features of oospore wall ornamentation in the genusTolypellawere examined using scanning electron microscopy (SEM). The taxonomic relationships among several species were discussed on the basis of oospore ultrastructure and measurements. In the case ofT. glomerataandT.
Jacek Urbaniak +2 more
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Ordovician marine Charophyceae and insights into land plant derivations
Nature PlantsThe emergence of land plants was a pivotal development in Earth history. It has been postulated that the evolutionary transition from freshwater streptophyte algae to land plants, or the canalization of plant meiosis, was completed during the Middle Ordovician (~460 Ma).
Chunfang Cai +2 more
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Lamprothamnium in Australia (Characeae, Charophyceae)
Australian Systematic Botany, 2013Charophytes in the genus Lamprothamnium exhibit a large amount of diversity, particularly in the examples from Australia, although little of that variation has been recognised at species level in the past. The Australian members of the genus are revised here on the basis of extensive new collections, examination of specimens in herbaria and ...
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Ultrastructure and phylogeny of the spermatozoid ofChara vulgaris (Charophyceae)
Plant Systematics and Evolution, 1997At maturity, spermatozoids of the green algaChara vulgaris are biflagellated, contain little cytoplasm, and coil for approximately 2 1/2 gyres within the mother cell wall. The anterior of the cell contains an ovoid headpiece anchoring two slightly staggered basal bodies that are positioned above and directly in front of approximately 30 linearly ...
Duncan, Tracy M. +2 more
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An overview of Nitella (Characeae, Charophyceae) in Australia
Australian Systematic Botany, 2009The genus Nitella Ag. in algal family Characeae is characterised by furcate (forked) branchlets, compressed oospores (i.e. oval in cross-section), terminal antheridia and a 10-celled coronula on the oogonium. Species of Nitella are submerged plants that grow in a variety of wetland and riverine habitats.
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Etude isoenzymatique chez Chara globularis Thuillier (Charophyceae )
Le Journal de botanique, 1999Isoenzymatic studies realized with Characeae (and with algae, in general) are few. The aim of the present work is to decide upon reliable methods on isoenzymatic electrophoresis applied to Chara globularis Thuillier. Samples of this species were used to test the activity of 16 enzymatic systems as well as the resolution degree obtained, by comparing ...
Simo Santalla, Pablo +3 more
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SPERMATOGENESIS IN COLEOCHAETE PULVINATA (CHAROPHYCEAE): EARLY BLEPHAROPLAST DEVELOPMENT
American Journal of Botany, 1989Transmission electron microscopy of serial thin sections was used to reconstruct several early developmental stages of the blepharoplast in Coleochaete pulvinata spermatids. These were compared to published studies of blepharoplast development in Charales and the closest relatives of ...
Linda E. Graham, Wyatt M. Repavich
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Chromosome numbers in Australian charophytes (Characeae, Charophyceae)
Phycologia, 2015Abstract Over the course of a 25 year ecological and taxonomic study, the chromosomes of Australian charophytes (family Characeae) were examined and enumerated. The usual number for members of Chara was n = 14 (for dioecious species) or n = 28 (for monoecious species); although Chara braunii has always been recorded as having n = 14 despite being ...
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Oospore dimensions and morphology in North AmericanTolypella(Charophyceae, Charophyta)
Journal of Phycology, 2015Characteristics of the oospores have been used to delimit sections and, in some cases, species in the genusTolypellaA. Braun. To test the utility of oospore characters for identifying North American species ofTolypella, we investigated oospores from field‐collected and herbarium specimens.
William, Pérez +3 more
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