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Abstract
A new species of Orthotrichum (O. lewinskyae) from the Rif Cordillera and the Mid Atlas Mountains (Morocco) is described. This taxon is included in subgenus Pulchella (Schimp.) Vitt section Pulchella Schimp. It is close to O. scanicum Grönv. and o. holmenii Lew.-Haap., from which it differs by the following combination of characters: large spores (22–30 μm); leaves linear-Ianceolate with wide and excavate at bases; leaf margins progressively narrowed at apices, which can be plane or incurved on one or both sides; upper leaf-cells larger than those of related taxa; seta intermediate between those of O. scanicum and o. holmenii.