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Orthotrichum casasianum is a species of moss in the family Orthotrichaceae. It is endemic to the Spanish province of Álava, in the Basque Country. It grows in less than 200 trees on the banks of the Bayas river. The species is critically endangered, and was added in 2013 to the Basque Catalog of Threatened Species.
At the time of its original publication, this species was known only from two well-preserved riparian woodlands along the Bayas River in Álava, northern Spain. It grows as an epiphyte on the bark of Alnus glutinosa (black alder), Sambucus nigra (elder), Fraxinus excelsior (ash) and Corylus avellana (hazel) in humid, eurosiberian-climate forests that experience periodic flooding. Similar humid woodland habitats in the Cantabrian Mountains and western Pyrenees may harbour additional populations.
Orthotrichum crassifolium · Orthotrichum scanicum · Orthotrichum moss
Text excerpted from the Wikipedia article Orthotrichum casasianum by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
