Ustilago alsines G. P. Clinton & Zundel on Stellaria praecox A. Nelson (= Stellaria nitens Nutt.) from North America belongs to the genus Microbotryum Lév. emend. Vánky; therefore the new combination M. alsines (G. P. Clinton & Zundel) M. Pi¹tek is proposed. The species is described in detail and also illustrated. Its affinities to similar species are discussed. The geographical range of this taxon is discussed.
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