Bryological and Lichenological Section/ABLS
Wynns, Justin , Murrell, Zack E. , Buck, William R. , McFarland, Kenneth D. .
Taxonomic studies in the aquatic moss genus Platyhypnidium(Brachytheciaceae).
Over 250 herbarium specimens of mosses belonging to the family Brachytheciaceae were studied in order to investigate the generic affinities of five aquatic taxa: Platyhypnidium pringlei, P. riparioides, P. muelleri, P. aquaticum, and Eurhynchium fuegianum. Fifty-three morphological characters were measured and/or scored for 100 specimens. Principal Components Analysis was performed on ratio-scale data to find significant differences between taxa based on leaf, cell, and capsule measurements. The highly variable internal transcribed spacer regions (ITS I and II) of the nuclear ribosomal DNA were also sequenced for 60 specimens belonging to fifteen taxa. Phylogenetic analyses of categorical data were performed to test the monophyly of the five aquatic taxa, and to evaluate the generic status of Platyhypnidium by establishing its phylogenetic position relative to the terrestrial genera Rhynchostegium and Eurhynchium. It appears that this aquatic group is artificial, and that a core group of species around P. riparioides is allied with Rhynchostegium.
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1 - Appalachian State University, Biology, 572 Rivers Street, Boone, North Carolina, 28608, USA
2 - New York Botanical Garden, Institute of Systematic Botany, 200Th Street & Southern Boulevard, Bronx, New York, 10458-5126, USA
3 - University of Tennessee, Department of Botany, 437 Hesler Biology Bldg, 1406 Circle Drive, Knoxville, Tennessee, 37996-1100, USA
Presentation Type: Oral Paper
Location: Salon A - Gov Ballroom/Hilton
Date: Monday, August 15th, 2005
Time: 2:45 PM