An order of mosses, in which the protonema is persistent and unique in structure; it has light-refracting properties and appears almost luminous. The leaves of the sterile shoots are arranged in 2 ranks and are nerveless. The capsule lacks a peristome. There is 1 genus, and 1 species, Schistostega pennata. Not common in Britain, it is found mainly in habitats with low light levels (e.g. in caves, rabbit burrows, fissures among siliceous rocks, mine-shafts, etc.) particularly in sandstone areas.
Subjects: Plant Sciences and Forestry.