The research of two outcrops of Devonian sandstone in the south of Leningrad region showed significant differences between its bryophyte species sets. In general, the sets vary in the liverworts and mosses ratio, the presence of calcicoles and the type of preferred substrate for most species. Both sets are comparable in number of rare bryophytes records. Several mosses of the early stages of colonization are widespread on both outcrops despite the differences in conditions, which influence on the next flora.