New localities for Bryum cyclophyllum (Bryaceae) in the Iberian Peninsula

Bryum cyclophyllum is reported from two new localities in the Iberian Peninsula and added to the Portuguese bryophyte flora. The habitat and worldwide distribution of this species are discussed: it shows a mainly Arctic-boreal distribution, widespread but not frequent; it is considered a rare or threatened moss in several European regions and with relict occurrences in more southern areas of North America. The ecology and distribution probably reflect migratory events during the last glacial period of the Pleistocene.