Molecular phylogenetic relationships and morphological evolution in the heterosporous fern genus Marsilea

Loading...
Thumbnail Image

Date

2007-01-01

Journal Title

Journal ISSN

Volume Title

Repository Usage Stats

63
views
145
downloads

Citation Stats

Abstract

Using six plastid regions, we present a phylogeny for 26 species of the heterosporous fern genus Marsilea. Two well-supported groups within Marsilea are identified. Group I includes two subgroups, and is relatively species-poor. Species assignable to this group have glabrous leaves (although land leaves may have a few hairs), sporocarps lacking both a raphe and teeth, and share a preference for submerged conditions (i.e., they are intolerant of desiccation). Group II is relatively diverse, and its members have leaves that are pubescent, sporocarps that bear a raphe and from zero to two teeth, and the plants are often emergent at the edges of lakes and ponds. Within Group II, five subgroups receive robust support: three are predominantly African, one is New World, and one Old World. Phylogenetic assessment of morphological evolution suggests that the presence of an inferior sporocarp tooth and the place of sporocarp maturation are homoplastic characters, and are therefore of unreliable taxonomic use at an infrageneric level. In contrast, the presence of a raphe and superior sporocarp tooth are reliable synapomorphies for classification within Marsilea. © Copyright 2007 by the American Society of Plant Taxonomists.

Department

Description

Provenance

Citation

Published Version (Please cite this version)

10.1600/036364407780360256

Publication Info

Nagalingum, NS, H Schneider and KM Pryer (2007). Molecular phylogenetic relationships and morphological evolution in the heterosporous fern genus Marsilea. Systematic Botany, 32(1). pp. 16–25. 10.1600/036364407780360256 Retrieved from https://hdl.handle.net/10161/21811.

This is constructed from limited available data and may be imprecise. To cite this article, please review & use the official citation provided by the journal.


Unless otherwise indicated, scholarly articles published by Duke faculty members are made available here with a CC-BY-NC (Creative Commons Attribution Non-Commercial) license, as enabled by the Duke Open Access Policy. If you wish to use the materials in ways not already permitted under CC-BY-NC, please consult the copyright owner. Other materials are made available here through the author’s grant of a non-exclusive license to make their work openly accessible.