Ignatov, M.S., O.I. Kuznetsova, V. Hugonnot, V.E. Fedosov & E.A. Ignatova. 2023. The genus Fissidens in
(2023) 32: 59–74
A preliminary molecular phylogenetic
analysis of Fissidens species of the F.
bryoides-complex revealed one species with a relatively
weak uni- to bistratose libmidium nested in a clade in
which almost all the samples have stout multistratose
limbidia. It is a well-defined species, relatively
widely distributed in European Russia, in scattered localities eastwards to the
Urals. In its nuclear ITS DNA sequences it is most similar to F. monguillonii from Altantic
Europe. However, it is a much smaller plant, resembling small phenotypes of F.
viridulus, and unlike F. monguillonii
it has a weak uni- or bistratose
limbidium. This Fissidens
species is described as a new species, F. mosquensis.
The clade formed by F. monguillonii
and F. mosquensis further includes the East
Asian F. lateralis (=F. bryoides
var. lateralis), a species also
characterized by a multistratose limbidium
and perichaetial leaves narrower than stem leaves. Fissidens mosquensis is
compared with F. bryoides and several morphotypes of F. viridulus s.l. A terrestrial form of F. rivularis