A new genus of lycopods from the Devonian of New York State
作者:
JAMES D. GRIERSON,
HARLAN P. BANKS,
期刊:
Botanical Journal of the Linnean Society
(WILEY Available online 1983)
卷期:
Volume 86,
issue 1‐2
页码: 81-101
ISSN:0024-4074
年代: 1983
DOI:10.1111/j.1095-8339.1983.tb00718.x
出版商: Blackwell Publishing Ltd
关键词: Catskill strata;Devonian;lycopods;New York State;Protolepidodendrales
数据来源: WILEY
摘要:
Drepanophycus colophyllusGrierson&Banks is transferred tollaskinsiaGrierson&Banks on the basis of the morphology of its leaves and its anatomical structure. Slender, dichotomizing axes bear helically arranged leaves that are falcate, petiolate, simple, lanceolate and entire. A solid cylinder of metaxylem is surrounded by ridges of protoxylem. Pitting on tracheid walls is annular, helical, reticulate, scalariform to circular‐bordered. This lycopod extends from early Givetian into early Frasnian time in the Catskill strata of eastern New York State. The effect of cleavage of fossiliferous rock on patterns observed on the exposed fossils and the bearing of recent research on the fossil history of lycopods are discusse
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