<abstract xmlns="http://www.w3.org/1999/xhtml"><p>The moss family Hylocomiaceae is studied for the generic level taxonomy within a molecular phylogenetic approach. We confirm segregating of the species formerly known as <italic>Rhytidiadelphus triquetrus</italic> to <italic>Hylocomiadelphus</italic> Ochyra &amp; Stebel from the genus <italic>Rhytidiadelphus</italic>. <italic>Hylocomiadelphus</italic> forms a clade with <italic>Loeskeobryum</italic> and <italic>Meteoriella</italic>, sharing with both genera cordate to auriculate leaf bases and non-squarrose leaves, and with the former undulate leaves and reticulate exostome teeth ornamentation. However, <italic>Loeskeobryum</italic> differs from <italic>Hylocomiadelphus</italic> in having paraphyllia, while <italic>Meteoriella</italic> has a straight capsule and reduced peristome, likely caused by its epiphytic ecology. In the group of species closely related to <italic>R. squarrosus</italic>, in addition to <italic>R. subpinnatus</italic>, the third species with North Pacific distribution is described as <italic>R. pacificum</italic>. <italic>Macrothamnium</italic> is found deeply nested in <italic>Rhytidiadelphus</italic>, although no nomenclatural implications are suggested at the moment due to insufficient sampling. <italic>Hylocomium splendens</italic> var. <italic>splendens</italic> and var. <italic>obtusifolium</italic> were found intermingled in the phylogenetic tree, indicating no correlation between morphology and variation in ITS region, thus supporting a view that these taxa are merely environmentally induced morphs.</p></abstract>

The moss family Hylocomiaceae is studied for the generic level taxonomy within a molecular phylogenetic approach. We confirm segregating of the species formerly known as Rhytidiadelphus triquetrus to Hylocomiadelphus Ochyra & Stebel from the genus Rhytidiadelphus. Hylocomiadelphus forms a clade with Loeskeobryum and Meteoriella, sharing with both genera cordate to auriculate leaf bases and non-squarrose leaves, and with the former undulate leaves and reticulate exostome teeth ornamentation. However, Loeskeobryum differs from Hylocomiadelphus in having paraphyllia, while Meteoriella has a straight capsule and reduced peristome, likely caused by its epiphytic ecology. In the group of species closely related to R. squarrosus, in addition to R. subpinnatus, the third species with North Pacific distribution is described as R. pacificum. Macrothamnium is found deeply nested in Rhytidiadelphus, although no nomenclatural implications are suggested at the moment due to insufficient sampling. Hylocomium splendens var. splendens and var. obtusifolium were found intermingled in the phylogenetic tree, indicating no correlation between morphology and variation in ITS region, thus supporting a view that these taxa are merely environmentally induced morphs.

On moss genera <italic>Hylocomiadelphus</italic> Ochyra &amp; Stebel and <italic>Rhytidiadelphus</italic> (Limpr.) Warnst.

Department of Geobotany, Faculty of Biology

Acta Musei Silesiae, Scientiae Naturales

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

On moss genera  Ochyra & Stebel and  (Limpr.) Warnst.

The moss family Hylocomiaceae is studied for the generic level taxonomy within a molecular phylogenetic approach. We confirm segregating of the species...

On moss genera Hylocomiadelphus Ochyra & Stebel and Rhytidiadelphus (Limpr.) Warnst.

Published Online: Jul 01, 2019

Page range: 123 - 134

DOI: https://doi.org/10.2478/cszma-2019-0012

Keywords
bryophytes, Hylocomiaceae, taxonomy, molecular phylogeny, phytogeography, new species, new genera, nomenclature

© 2019 Michael S. Ignatov et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

On moss genera Hylocomiadelphus Ochyra & Stebel and Rhytidiadelphus (Limpr.) Warnst.

Published Online: Jul 01, 2019

Page range: 123 - 134

DOI: https://doi.org/10.2478/cszma-2019-0012

Keywordsbryophytes, Hylocomiaceae, taxonomy, molecular phylogeny, phytogeography, new species, new genera, nomenclature

© 2019 Michael S. Ignatov et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
bryophytes, Hylocomiaceae, taxonomy, molecular phylogeny, phytogeography, new species, new genera, nomenclature