The genus Pseudocrossidium is represented
in Russia by two species, P. hornschuchianum (Schultz) R.H.Zander and P.
obtusulum (Lindb.) H. A. Crum & L. E. Anderson. The latter species has
been known from Europe and North America, but recently it was collected on
Anabarskoe Plateau (subarctic Siberia), Middle Ural Mts. in Perm Province and
in Rostov-na-Donu Province (southern part of european Russia). A revision of
two available herbarium collections of P. hornschuchianum from Asian
Russia revealed that one of them also belongs to P. obtusulum (from
subarctic Yakutia, middle course of Indigirka River), while the other is not a
member of this genus. Thus P. hornschuchianum is excluded from the flora
of Asian Russia, but it is confirmed for the southern and south-eastern regions
of European Russia, and an unconfirmed record remains for Kaliningrad Province.
Pseudocrossidium revolutum (Brid.) R.H.Zander is excluded from the moss
flora of Russia. Descriptions, illustrations, ecological data, and key for
species identification are provided. Also Pseudocrossidium obtusulum is
reported as a new species for Turkmenistan.