Zhang, Li-Bing , He, Hai , Gao, Xin-Fen .
Diversity, Cryptic speciation, and phylogeny of the fern genus Polystichum (Dryopteridaceae): A large-scaleanalysis.
One of the most exciting examples of apparently rapid speciation in ferns is the genus Polystichum (Dryopteridaceae). As one of the largest genera of ferns, Polystichum contains ca. 400 species. This genus is nearly cosmopolitan, but the species are most numerous in subtropical regions, with the highest diversity clearly in Asia, especially in southwestern China and adjacent regions. While more than half of the ca. 400 species evolved recently as result of fast radiation, little is known about the species of Polystichum in limestone areas, especially in karst caves, in southern China. There are two competing hypotheses about the ages of cave species: old relics among different caves vs. young radiation. Molecular data placed cave species in younger lineages suggesting that they are new endemics. Most notably, several morphologically and palynologically different cave species formed well-supported monophyletic groups. These species occur geographically in adjacent areas. Are these hard orsoft polytomies? More molecular data will be added to answer this question. Molecular data also help identify some cryptic species unrecognizable using morphological data only.
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1 - Missouri Botanical Garden, Science and Conservation, P.O. Box 299, St. Louis, MO, 63166, USA
2 - Chongqing Normal University, College of Life Sciences, Shapingba, Chongqing, 400047, China
3 - Chengdu Institute of Biology, Chinese Academy of Sciences, The ECORES Lab, P.O. Box 416, Chengdu, Sichuan, 610041, China
Presentation Type: Oral Paper:Papers for Sections
Location: Waterman Room/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 11:00 AM