Abstract
Plagiothecium berggrenianum Frisv. is newly reported from North America and its known distribution in North America and the European Arctic is mapped. Recently, I became aware of Steere's (1975) paper in which Plagiothecium cavifolium (Brid.) Iwats. was mentioned as one of the species from Greenland. material was aberrant, and was described in the following way: The stems are not at all flattened; the leaves are conspicuously decurrent with hyaline wings, the margins are strongly recurved throughout, and the apiculus is sharply reflexed. This description indicated that P. berggrenianum Frisv. might be the correct name for it. Similar plants were said to occur in northern Alaska (Steere 1975). I have seen the material, and have ascertained that it belongs to P. berggrenianum. It seems that the species is restricted to high latitudes and has a wide, probably circumpolar distribution (Fig. 1).
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