Bryological and Lichenological Section/ABLS
Chang, Ying , Murray, Barbara M. , Graham, Sean W. .
Phylogenetics of costate Andreaeaceae.
The granite mosses, Andreaeacea, represent the descendants of one of the earliest splits in moss evolution. The family consists of one genus, Andreaea, and about 50 species. There are two subgenera: Chasmocalyx and Andreaea, and the latter is further divided into two sections: Nerviae and Andreaea. Subgenus Chasmocalyx and section Nerviae are composed of costate taxa, while section Andreaea has ecostate taxa. The monophyly of these subgenera and sections has not been tested, and phylogenetic relationships remain unclear. We reconstruct the phylogeny of Andreaea with a focus on the costate members, using six plastid DNA markers. Our results do not support the monophyly of any subgenera or sections as currently circumscribed. We identify four major lineages within Andreaea, clades comprising: (1) A.nivalis and A.rigida (northern hemisphere Chasmocalyx); (2) the majority of Nerviae; (3) a mixture of costate taxa and members from section Andreaea, and; (4) one isolated species, A.blyttii. We also sampled 14 plastid genes from representatives of each of the four Andreaea lineages and taxa from the other major moss groups to determine the root of Andreaea with good bootstrap support. We find root of the family that lies between an A.blyttii-A.nivali-A.rigida clade and the remaining members of Andreaea. Based on the current phylogeny, we also reconstruct the evolution of some morphological characters of interest.
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1 - University of British Columbia, UBC Botanical Garden and Certre for Plant Research, 6804 SW Marine Drive, Vancouver, BC, V6T 1Z4, Canada
2 - University of Alaska, University of Alaska Museum of the North, Herbarium, 907 Yukon Drive, Fairbanks, AK, 99775-6960, USA
Presentation Type: Oral Paper:Papers for Sections
Location: 554A/Convention Center
Date: Monday, August 2nd, 2010
Time: 2:15 PM