The genus Mitrula in North America

The genus Mitrula is monographed for North America. Endemic to North America are M. elegans, M. lunulatospora sp.nov., and M. borealis sp. nov. The last-named species also occurs in Europe, as does M. paludosa. Each species has a distinctive geographic range, sporulating period, and ascospore morphology.A neotype is chosen for Mitrula paludosa and both M. norvegica and M. omphalostoma are placed in synonymy with that species. Mitrula morchelloides is transferred to the genus Verpatinia. Mitrula gracilis is transferred to the genus Bryoglossum gen. nov.Each of the accepted species of Mitrula is illustrated and described, and a key to the species is given.