Abstract: Geastrum nanum Pers. was found in 1972 in Björkör Nature Reserve in Åland, SW Finland. This is the first find of G. nanum from Finland, since an earlier record of the species was based on a misidentification. A description is given of the four gastrocarps from Björkör. The locality, a dry, stony meadow grazed by sheep, has a rather poor and common vascular plant flora. The total distribution of G. nanum is described.