Abstract
M. fruticulosa is European and develops a blue pigment in long-dried material. The Japanese and North American plants, which lack the pigment, are named M. temperata. About 1/3 of British specimens previously determined as M. fruticulosa have proved to be M. temperata. It is distinct from M. fruticulosa in many characters including the absence of brood-bodies on the costa. Sporophytes of M. fruticulosa are described for the 1st time. M. temperata favors more base-deficient substrata than M. fruticulosa and has a more southern distribution in the British Isles.