Grimmia horrida (Grimmiaceae), a new species from the Iberian Peninsula

Grimmia horrida, a new species from the NW of the Iberian Peninsula is described and illustrated. The new species is characterized by the ciliate hair-points. Additionally, the leaves are linear, strongly keeled so that the two blades of the lamina touch each other near the costa and then curve outward, the lamina is bistratose only at the margins and in small areas, and the connection to the terete hair-point is very abrupt in most leaves. Although all the specimens are sterile, this combination of characters is unique in Grimmia.