As Pucciniastrum sparsum (Wint.) Fisch. Det. by J.A. Stevenson Uredo arbuti Dietel & Holway and Pucciniastrum sparsum Fischer (or Fischer ex Klebahn) = Thekopsora sparsa (Winter) Magnus see N. Hiratsuka et al The Rust Fungi of Japan p.148 1992
isotype
W. C. Blasdale
1893-04-01
01 Apr 1893
United States of America, California, Mt. Tamalpais