Uredo alpestris Schröter, 1875

on Viola

gall

Only uredinia are known, yellow, in two forms. The primary ones, appearing in ± June, are minute, without paraphyses, with thin-walled spores that apically bear a 5 µm long apiculus. The secondary ones, ± September, are up to 1 mm and surrounded by paraphyses; their spores are thick-walled and apically rounded.

hostplants

Violaceae, narrowly monophagous

Viola biflora.

references

Blumer (1946a), Brandenburger (1985a: 393), Gäumann (1959a), Klenke & Scholler (2015a), Maier, Begerow, Weiß & Oberwinkler (2003a).

mod 15.viii.2018