Revision of herbarium material
confirms in Russia 5 species and 1 subspecies of Hypnum section Hamulosa:
H. callichroum Brid., H. hamulosum Schimp., H. holmenii
Ando, H. plicatulum (Lindb.) A. Jaeger, H. subimponens Lesq.
subsp. subimponens, H. subimponens subsp. ulophyllum (Muell. Hal.) Ando. Key for taxa identification is given, and description, illustrations,
ecologo-coenotic characteristics and maps of geographic disctribution within
Russia are provided for each taxon.