Ignatov, M.S., O.I. Kuznetsova, E.A. Ignatova. 2022. The genus Campylophyllopsis (Bryophyta) in Russia revisited

Arctoa (2022) 31: 22–33

doi: 10.15298/arctoa.31.04

The genus Campylophyllopsis in Russia is revised based on morphology and the molecular phylogenetic analysis of nuclear (ITS) and plastid (trnL–F and rbcL–atpB) markers. The main problem tested was the position of ‘Campylium squarrosulum’, an East Asian species that is similar in aspect to Campylophyllopsis sommerfeltii but has single leaf costa, which was never reported for other species of this genus. Molecular data support its position in the genus, showing its close relationships to Campylophyllopsis sommerfeltii. Two specimens from the Russian Far East also similar in aspect to Campylophyllopsis were found to be strongly different in DNA sequences from all Campylophyllopsis species; they also differ from Campylophyllopsis in having a well differentiated stem hyalodermis and median leaf cells with prominent papillae above the distal cell ends. The latter features are rare in the Amblystegiaceae and are diagnostic for the genus Podperaea. These plants, however, were found to be quite unrelated to Podperaea phylogenetically, but were resolved in the clade with Campylophyllopsis, Pseudocampylium, Serpoleskea, Pseudoamblystegium, and Hygrohypnum, being most closely related to Hygrohypnum styriacum. They are described as new species and genus, Jankuceraea pacifica Ignatov & Ignatova.