Schistidium

Schistidium is a genus of mosses belonging to the family Grimmiaceae. These mosses are typically found in arid or semi-arid environments, often growing on rocks or exposed soil. They are characterized by their small size, usually forming dense cushions or mats. The leaves of Schistidium are typically ovate to lanceolate, with a prominent midrib. A distinctive feature of many species is the presence of a hyaline (clear) awn or hair-point at the leaf apex, which can aid in water absorption and retention in dry conditions.

The sporophytes of Schistidium are usually solitary and borne on short setae. The capsule is often immersed or emergent, and the peristome teeth are typically short and fused at the base. Reproduction can occur both sexually through spores and asexually via fragmentation of the plant.

Schistidium species are widely distributed across various continents, with a notable presence in temperate and alpine regions. Their ability to tolerate desiccation makes them important colonizers in harsh environments. Identification of species within the genus often relies on microscopic characters, including leaf morphology, sporophyte structure, and the nature of the leaf apex. Several species are recognized, and ongoing research continues to refine taxonomic understanding of this diverse genus.