A Novel Late Devonian (Frasnian) Woody Cladoxylopsid from China

Autor:	Paul Kenrick, Bao-Yin Geng, Jason Hilton
Rok vydání:	2003
Předmět:	Appendage biology Sporangium Plant Science Anatomy biology.organism_classification Paleontology Stele Tracheid Pseudosporochnales Botany Cladoxylopsida Late Devonian extinction Fern Ecology Evolution Behavior and Systematics
Zdroj:	International Journal of Plant Sciences. 164:793-805
ISSN:	1537-5315 1058-5893
DOI:	10.1086/376815
Popis:	An investigation of the fossil plant Polypetalophyton wufengensis Geng ex Hilton, Geng et Kenrick provides new data on an early woody member of the Late Paleozoic group Cladoxylopsida. The morphology and anatomy of the lateral branch system have been studied in detail. Branches were produced in an irregular helix, but ultimate appendages were borne in a pinnate arrangement on a frondlike system. Vegetative “pinnules” were dichotomous and planar (Sphenopteridium‐type), whereas fertile “pinnules” were decussately branched and bore fusiform sporangia terminally. Anatomically, Polypetalophyton is unusual because it has a stele that consists of several primary vascular segments, each of which consists of tracheids and parenchyma surrounded by wood comprising radially aligned tracheids with ray‐like slits. Polypetalophyton is clearly most closely related to the extinct Cladoxylopsida, which is a poorly understood group of considerable phylogenetic significance. Comparisons are made with Pseudosporochnales and I...
Databáze:	OpenAIRE
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