Orthotrichum is a genus of moss in the family Orthotrichaceae. It is distributed throughout the world. There are about 125 species in the genus. Species include: * * * * – Bartram's orthotrichum moss * – Bolander's orthotrichum moss * Orthotrichum casasianum * * Orthotrichum crassifolium Hook.f. & Wilson * * * * * * * * – Hall's orthotrichum moss * – Holzinger's orthotrichum moss * – Keever's orthotrichum moss * * Orthotrichum lyellii * – obtuseleaf aspen moss * – Ohio orthotrichum moss * * – xerophytic limestone moss * * * * * – Pylais' orthotrichum moss * – streamside orthotrichum moss * * Orthotrichum scanicum Grönvall * * – lanceolateleaf rock moss * – stellate orthotrichum moss * – strangulate orthotrichum moss * Ort