Sematophyllum
substrumulosum (Hampe)
E. Britton found as a new species record for Russia in Zabaikalsky Territory in
Eastern Siberia, ca. 8 000 km from its nearest localities in Southern Europe. This
is the first record of the genus, as well as the family Sematophyllaceae, s.
str. (excluding Pylaisiadelphaceae) from Russia. Interestingly, this species
known in the Mediterranean region in temperate climate is found in Russia in
mountain tundra in extremely cold environment. Description, illustrations and
phytogeographical considerations are given.