Microbotryum shastense (Zundel) Vánky, 67:50, 1998. ! Ustilago shastensis Zundel, The Ustilaginales of the World: 201, 1953. U.S.A., California, Siskiyou Co., Mt. Shasta, on Polygonum shastense W. H. Brewer, 08 August 1998, F. Oberwinkler, M. Berbee, G. Thorn & Vánky. VIA 7014, isotopotype.