Bryological Research
Online ISSN : 2424-2624
Print ISSN : 1343-0254
A preliminary phylogeny of Hypnales (Musci) as inferred from chloroplast rbcL sequence data
Hiromi TsubotaNarumi NakaoTomotsugu ArikawaTomio YamaguchiMasanobu HiguchiHironori DeguchiTarow Seki
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1999 Volume 7 Issue 8 Pages 233-248

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Abstract

Phylogenetic analyses were carried out to investigate the relationships among families of the order Hypnales, based on the chloroplast ribulose 1,5-bisphosphate carboxylase/oxygenase large subunit (rbcL) gene data. We sequenced the chloroplast rbcL gene from 11-hypnalean mosses. These sequences proved to be no significantly different in GC content from those reported for Marchantia polymorpha and Physcomitrellapatens. Full length of the sequences was the same as in other bryophytes previously reported, and 3 or 6 bp shorter than that of tracheophytes. Phylogenetic trees were constructed by the neighbor-joining (NJ), minimumevolution (ME), maximum-parsimony (MP) and maximum-likelihood (ML) methods for 34 rbcL sequences. The topologies with NJ, ME, MP and ML methods were nearly consistent with each other. The results suggest that the Hypnales are not monophyletic. The genus Brotherella is distinguished as a resolved monophyletic group, in which Hypnum tristo-viride and Heterophyllium nematosum are also placed. The present study also suggests that the genus Entodon be placed in a clade near the Brotherella. The result does not concur with Vitt (1984) nor Buck and Vitt (1986), who suggested that the Hypnales would have been separated into single costa groups and a double costa group at an early evolutional stage. The result showed a necessity of reconsideration on the familial circumscription of the order Hypnales.

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1999 The Bryological Society of Japan
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