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Orthotrichum tortidontium sp. nov. (Orthotrichaceae, Bryopsida), an epiphytic moss from western Mediterranean mountains
A new epiphytic Orthotrichum (O. tortidontium) is described from Mid- Atlas Mountains of Morocco and Betic Sierras of southern Spain. The new species is in subgenus Gymnoporus (Braithw.) Limpr., section Affinia Schimp. and shows the following differential features: long lanceolate, acute or acuminate leaves; emergent, slightly striate capsule; and a peculiar radiate ornamentation of the 16 exostome teeth resulting from the splitting of the original 8-teeth bigeminate exostome. Description and data on the ecology and distribution of the new taxon are provided, as well as S.E.M. micrographs and drawings of the most significant characters.