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Chloroplast data reveal two conflicting hypotheses for the positions of Campylostelium and Grimmia pitardii (Bryophyta)

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Abstract:

Due to conflicting morphological characters, the systematic placement of the Mediterranean-Central Asian Grimmia pitardii, lately considered a member of Campylostelium (Ptychomitriaceae), has been controversial. Phylogenetic inferences based on the chloroplast gene rps4 and the trnL-F region were performed to clarify its systematic affinities. Grimmia pitardii is consistently resolved as a member of a maximally supported clade together with the genus Campylostelium. This combined clade forms the sister group to a similarly high supported clade comprising Grimmia, Racomitrium, Coscinodon, and Schistidium. Consequently, G. pitardii must be treated as Campylostelium pitardii (Corb.) E. Maier. Analysis of the systematic position of Campylostelium and Ptychomitrium, traditionally placed in the family Ptychomitriaceae, yielded two conflicting topologies: one groups Ptychomitrium and Campylostelium, whilst the second branches Campylostelium first, grouping Ptychomitrium with Grimmiaceae.

Keywords: BRYOPHYTA; CAMPYLOSTELIUM; CAMPYLOSTELIUM PITARDII; CHLOROPLAST SEQUENCES; GRIMMIA; GRIMMIACEAE; PTYCHOMITRIACEAE; PTYCHOMITRIUM; SYSTEMATICS; TRNL-F; TRNS-RPS4

Document Type: Research Article

Affiliations: 1: Real Jardin Botánico (CSIC), Plaza de Murillo 2, 28014 Madrid, Spain 2: Institute for Botany, Technical University Dresden, 01062 Dresden, Germany 3: Departamento de Biología Vegetal (Botánica), Facultad de Biología, Universidad de Murcia, 30100 Espinardo (Murcia), Spain

Publication date: February 1, 2007

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