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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 &amp; 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 Hylocomiadelphus Ochyra & Stebel and Rhytidiadelphus (Limpr.) Warnst.