MSA - Systematics/Evolution
Padamsee, Mahajabeen , McLaughlin, David J. .
Seeing red: an exploration of morphological characters in the Psathyrellaceae using molecular phylogenetic analyses.
Molecular phylogenetic analyses of mushrooms have demonstrated that various morphological characters traditionally used to delimit genera are homoplasious. However, molecular phylogenetic analyses can also provide the framework within which the evolution and taxonomic utility of morphological characters can be examined. Evidence is presented for a new genus in the mushroom family Psathyrellaceae based on a combination of microscopic features and molecular phylogenetic evidence. This genus consists of psathyrelloid mushrooms with red, smooth spores that typically also possess thick-walled encrusted cystidia. Phylogenetic analyses of nuclear ribosomal large subunit DNA and elongation factor 1-alpha sequences confirmed the placement of this new genus as a unique lineage sister to the ornamented-spore genus Lacrymaria. The evolution of some morphological characters is interpreted and discussed in light of the two sister lineages. Recently uncovered synapomorphic characters are discussed in regard to the taxonomic status of the two genera.
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1 - Louisiana State University Agricultural Center, Department of Plant Pathology and Crop Physiology, 302 Life Sciences Bldg., Baton Rouge, LA, 70803, U.S.A.
2 - University of Minnesota, Department of Plant Biology, 250 Biological Sciences Center, 1445 Gortner Ave., St. Paul, MN, 55108, USA
Presentation Type: Oral Paper:Papers for Topics
Location: Cottonwood A/Snowbird Center
Date: Tuesday, July 28th, 2009
Time: 11:15 AM