A Unified Approach to Taxonomic Delimitation in the Fern Genus Pentagramma (Pteridaceae)
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© Copyright 2015 by the American Society of Plant Taxonomists.The native goldback and silverback ferns of western North America, composing the genus Pentagramma, are phylogenetically isolated within the xeric-adapted cheilanthoid clade. Although species-poor compared to its sister group, Pentagramma encompasses a diverse array of morphotypes, cytotypes, and flavonoid chemotypes. Because the differences are generally cryptic, however, the various entities are usually recognized at an infraspecific level. In recent years, as many as five subspecies have been ascribed to P. triangularis, and only P. pallida has been considered sufficiently divergent to warrant recognition as a distinct species. In this study, we take a unified approach to taxonomic delimitation in Pentagramma. Combining spore studies with phylogenetic analyses of plastid and nuclear sequences, we identify six genetically and morphologically distinct diploid lineages, each of which is here treated as a species. A new species is described (P. glanduloviscida) and three new combinations are made (P. maxonii, P. rebmanii, and P. viscosa).
Published Version (Please cite this version)10.1600/036364415X689366
Publication InfoPryer, Kathleen M; Schuettpelz, E; & Windham, MD (2015). A Unified Approach to Taxonomic Delimitation in the Fern Genus Pentagramma (Pteridaceae). Systematic Botany, 40(3). pp. 629-644. 10.1600/036364415X689366. Retrieved from http://hdl.handle.net/10161/10796.
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Professor of Biology
My research focuses on understanding the evolutionary relationships of ancient land plants, especially ferns and horsetails, by integrating evidence from morphology, molecules (DNA sequence data from multiple genes), and the fossil record. I use an explicit phylogenetic framework to examine the morphological evolution of various sporophytic and gametophytic characters within vascular plants, and to gain insight into the evolution of various life history traits and the body plans that typ