Scouleriaceae. Genus Scouleria

1. Upper leaf margins with several rows of large, thick cells, forming a dark border, occasionally in lower 1/3-1/2(-2/3) of leaf with bistratose submarginal border of several rows of elongate cells; peristome teeth not fragile, usually present in deoperculate capsules, reflexed when dry; columella В± narrowly attached to the operculum; operculum with moderately long, subobtuse beak — 1. S. pulcherrima

This species is sporadically distributed in Asian Russia, from Taimyr to Chukotka and to Vitim and Amur River basins. It grows on rocky substrates: cliffs, boulders, sometimes pebbles along temporarily flooding banks of rivers and creeks, or more rarely on lake shores. It is abundant in suitable habitats, but in Genusl the species is not common.

— Leaf margins not bordered; peristome teeth fragile, usually not present in deoperculate capsules, adherent to the inner surface of the operculum; columella broadly attached to the operculum; operculum with very small, acute apiculus — 2. S. rschewinii

This species was described from the lower course of the Yenisey River; most recent records of it are from the Vilyui River basin in Yakutia and from Vitim River in Irkutsk Province; also known from a few localities in NE Yakutia and Chukotka. It grows in about the same habitats as S. pulcherrima.