Andreaeobryum

…genus in each order, Andreaea, Andreaeobryum, and Takakia, and probably fewer than 100 species in the entire subclass. Until recently, the genus Takakia (2 species) was considered a liverwort rather than a moss, and its classification remains less than perfectly understood. Subclass Sphagnidae Sporophytes lacking a seta; subspherical sporangium