Abstract Detail

Bryology and Lichenology

Montgomery, Sean [1], Bell, David [1], Chang, Ying [2], Graham, Sean W. [1].

Phylogenetics and taxonomy of the moss genus Andreaea.

Andreaea Hedw., the only genus of the granite moss family Andreaeaceae (Bryophyta), is one of the major non-peristomate moss lineages and represents a very early split in moss phylogeny. The genus has a unique spore dispersal mechanism and is mainly distributed in high latitude and high altitude regions of both hemispheres, with greatest diversity in cool-temperate regions. It has traditionally been divided into two or three infrageneric subgroups at various ranks, with the most broadly adopted taxonomy in recent years including three subgenera (Acroschisma Hook. f. & Wilson, Chasmocalyx (Braithw.) Limpr., and Andreaea) and two sections (Nerviae Card. ex Broth. and Andreaea). Due to its unique sporangium morphology some authors have treated the only member of subgenus Acroschisma (A. wilsonii Hook. f.) as a separate genus. Subgenera Andreaea and Chasmocalyx are each defined based mainly on characteristics of their perichaetial leaves, while the two sections of subgenus Andreaea are mainly differentiated by the presence or absence of costae in vegetative leaves. To examine the phylogeny of Andreaea and test the current infrageneric taxonomy (subgenera and sections), we sampled 39 specimens representing 22 different species, with an emphasis on the costate taxa, which represent approximately one third of the species in the genus. We added a nuclear region (ITS2) to previously sequenced plastid DNA regions, and demonstrated a high level of congruence between trees inferred from nuclear and plastid markers. None of the currently recognized infrageneric taxa are recovered as monophyletic, and the trees imply homoplasy in leaf costae. Andreaea wilsonii is well nested in the genus, but is distinct from other taxa and has an elevated substitution rate in both plastid and nuclear trees. An expanded plastid dataset for a sub-sample of five species representing the major lineages allows us to infer a well-supported root in Andreaeaceae.

1 - University of British Columbia, Department of Botany, 3529-6270 University Blvd., Vancouver, BC, V6T 1Z4, Canada
2 - Oregon State University, Department of Botany and Plant Pathology, 2082 Cordley Hall, Corvallis, OR, 97331, USA

Keywords:
Bryophyte
phylogenetics
Andreaea
taxonomy.

Presentation Type: Poster
Session: P, Bryology and Lichenological Section/ABLS Posters
Location: Exhibit Hall/Savannah International Trade and Convention Center
Date: Monday, August 1st, 2016
Time: 5:30 PM This poster will be presented at 6:15 pm. The Poster Session runs from 5:30 pm to 7:00 pm. Posters with odd poster numbers are presented at 5:30 pm, and posters with even poster numbers are presented at 6:15 pm.
Number: PBR002
Abstract ID:778
Candidate for Awards:None