Create your own conference schedule! Click here for full instructions

Abstract Detail



Pteridology

Xu, Xiaogang [1], Zhang, Li-Bing [2].

A revison of the fern genus Pleocnemia (Dryopteridaceae).

The circumscription, taxonomy, and phylogeny of the Old World fern genus Pleocnemia Presl (1836) have been confusing. It was often been treated as a member of Tectariaceae, while recent molecular data resolved it as a member of Dryopteridaceae. Many species in Pleocnemia have been transferred to various genera, e.g., Dictyopteris, Tectaria (incl. Aspidium). Different authors recognized various numbers of species in the genus. A taxonomic revision based on literature and herbarium studies shows that the synapomorphies of the genus include: (1) presence of areoles of venation; (2) the unicellular yellow or orange glands; (3) a distorted form of vascular anatomy of stpies; and (4) chromosome n = 41. The important taxonomic features include: presence or absence of sinus-teeth that project out of the plane of a pinnule, and morphology of the unicellular yellow or orange glands. About 23 species are recognized in this revision, of which P. acuminata, P. andaiensis , P. brongniartii, P. conjugata, P. irregularis, P. nesiotica, P. seranensis are mainly distributed in southern part of the areas, and P. winitii, P. hamata, P. kwuangsiensis, P. submembranacea, etc. are mainly distributed in northern part of the areas.


Log in to add this item to your schedule

1 - Nanjing Forestry University, College of Biology and Environment, Nanjing, Jiangsu, 210037, China
2 - Missouri Botanical Garden, P.O.Box 299, St. Louis, Missouri, 63166, USA

Keywords:
taxonomy.

Presentation Type: Oral Paper
Session: 7, Pteridological Section/AFS
Location: 203/Savannah International Trade and Convention Center
Date: Monday, August 1st, 2016
Time: 11:00 AM
Number: 7011
Abstract ID:783
Candidate for Awards:Edgar T. Wherry award


Copyright © 2000-2016, Botanical Society of America. All rights reserved