The genus Heteroscyphus
is recorded for the first time from Russia from Primorye Territory, southern
part of the Russian Far East, Lozovskiy Nature Reserve (ca. 43°13-14’ N
134°01-02’ E, ~300 m alt.). The plants were identified as H. planus f. subinteger
– a small form of the species with subentire leaves. Distinctive features of
the genus Heteroscyphus from the most close genus Chiloscyphus s.l.
(subgenera Chiloscyphus and Lophocolea) are listed.
Differentiation of sterile plants of H. planus f. subinteger from
species of Pedinophyllum, Chiloscyphus s.str., and Ch. appalachicola which
may be confused with it is given. Complete description, illustrations and
key to differentiation of H. planus from H. argutus, H.
coalitus and H. tener which occurrence is most probable in Russia are
provided.