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The lycophytes, when broadly circumscribed, are a vascular plant (tracheophyte) subgroup of the kingdom Plantae. They are sometimes placed in a division Lycopodiophyta or Lycophyta or in a subdivision Lycopodiophytina. They are one of the oldest lineages of extant (living) vascular plants; the group contains extinct plants that have been dated from the Silurian. Lycophytes were some of the dominating plant species of the Carboniferous period, and included tree-like species, although extant lycophytes are relatively small plants.
John Torrey was an American botanist, chemist, and physician. Throughout much of his career, he was a teacher of chemistry, often at multiple universities, while he also pursued botanical work, focusing on the flora of North America. His most renowned works include studies of the New York flora, the Mexican Boundary, the Pacific railroad surveys, and the uncompleted Flora of North America.
Paleobotany, which is also spelled as palaeobotany, is the branch of botany dealing with the recovery and identification of plant remains from geological contexts, and their use for the biological reconstruction of past environments (paleogeography), and the evolutionary history of plants, with a bearing upon the evolution of life in general. A synonym is paleophytology. It is a component of paleontology and paleobiology. The prefix palaeo- means "ancient, old", and is derived from the Greek adjective παλαιός, palaios. Paleobotany includes the study of terrestrial plant fossils, as well as the study of prehistoric marine photoautotrophs, such as photosynthetic algae, seaweeds or kelp. A closely related field is palynology, which is the study of fossilized and extant spores and pollen.
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The zosterophylls are a group of extinct land plants that first appeared in the Silurian period. The taxon was first established by Banks in 1968 as the subdivision Zosterophyllophytina; they have since also been treated as the division Zosterophyllophyta or Zosterophyta and the class or plesion Zosterophyllopsida or Zosteropsida. They were among the first vascular plants in the fossil record, and had a world-wide distribution. They were probably stem-group lycophytes, forming a sister group to the ancestors of the living lycophytes. By the late Silurian a diverse assemblage of species existed, examples of which have been found fossilised in what is now Bathurst Island in Arctic Canada.
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Polysporangiophytes, also called polysporangiates or formally Polysporangiophyta, are plants in which the spore-bearing generation (sporophyte) has branching stems (axes) that bear sporangia. The name literally means many sporangia plant. The clade includes all land plants (embryophytes) except for the bryophytes whose sporophytes are normally unbranched, even if a few exceptional cases occur. While the definition is independent of the presence of vascular tissue, all living polysporangiophytes also have vascular tissue, i.e., are vascular plants or tracheophytes. Extinct polysporangiophytes are known that have no vascular tissue, and so are not tracheophytes.
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Donovan "Don" Stewart Correll was an American botanist, plant collector, and plant taxonomist, specializing in orchids.
Warren Lambert Wagner is an American botanist, a curator of botany, and a leading expert on Onagraceae and plants of the Pacific Islands, especially plants of the Hawaiian Islands.
Geraldine Anne Allen is a botanist, professor of biology, and herbarium curator at the University of Victoria in British Columbia, Canada. She obtained formal education at the University of British Columbia and Oregon State University, earning a Doctor of Philosophy degree in botany and plant pathology from the latter in 1981. During her career, she has authored or co-authored over 50 publications, including genera chapters for Flora of North America and the Jepson Manual. She also has authored several species of the Erythronium genus.
References
- ↑ "HUH - Databases - Botanist Search".
- 1 2 "Patricia G. Gensel".
- ↑ "Gensel, Patricia Gabbey". Who's Who of American Women, 1983-1984. Marquis Who's Who. 1983. p. 284. ISBN 978-0-8379-0413-9.
- ↑ "Labs - Patricia G. Gensel". Archived from the original on April 2, 2015. Retrieved April 9, 2016.
- ↑ "Botany.org (pdf)" (PDF). botany.org.
- ↑ Knaus, Margaret Jane (1995). "The Species of the Early Carboniferous Fossil Plant Genus Genselia". International Journal of Plant Sciences. 156 (1): 61–92. doi:10.1086/297230. JSTOR 2474900. S2CID 83629753.
The standard author abbreviation Gensel is used to indicate this person as the author when citing a botanical name . [1]
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