Phylogenetic Relationships Among the Diplolepideous-alternate Mosses (Bryidae) Inferred from Nuclear and Chloroplast DNA Sequences

The diplolepideous-alternate peristome, when most highly developed, has endostome segments attached to a basal membrane and positioned alternate to the outer exostome teeth, with cilia often present between the segments. This peristome type defines the Bryidae, which includes four orders: the Bryale...

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Bibliographic Details
Published in:The Bryologist 2000-01, Vol.103 (2), p.224-241
Main Authors: Cox, C J, Goffinet, B, Newton, A E, Shaw, A J, Hedderson, TAJ
Format: Article
Language:English
Subjects:
Bryales
Hookeriales
Hypnales
Leucodontales
rps4 gene
rRNA 18S
Splachnidae
trnF gene
trnL gene
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Summary:The diplolepideous-alternate peristome, when most highly developed, has endostome segments attached to a basal membrane and positioned alternate to the outer exostome teeth, with cilia often present between the segments. This peristome type defines the Bryidae, which includes four orders: the Bryales, Leucodontales, Hypnales, and Hookeriales, of which the latter three are mainly pleurocarpous in their growth form. Chloroplast (rbcL, rps4, and trnL-trnF) and nuclear (18S rRNA) gene sequences have been analyzed using the parsimony optimality criterion to elucidate relationships among the Bryidae. The analyses strongly support the paraphyly of the Bryidae, with the Splachnidae, and possibly the Orthotrichidae, having arisen from ancestors within the Bryidae. The Leucodontales, Hypnales, and Hookeriales form a monophyletic group, as do the pleurocarpous members of the Bryidae. However, the two pleurocarpous clades are not resolved as sister groups, although their non-monophyly is not supported by the bootstrap. The phylogenetic hypothesis provides a context in which to infer evolutionary transitions in some key morphological characters relating to the peristome and the transition from the acrocarpous to pleurocarpous growth forms.
ISSN:0007-2745
DOI:10.1043/0007-2745(2000)103(0224:PRATDA)2.0.CO;2