Uromyces pisi-sativi - on Euphorbia angulata (left) and Euphorbia verrucosa (right) (4743' N 1625' E)

Description:

2011-05-07 Burgenland, district Mattersburg (Kogelberg, 310 msm Quadrant 8264/4).Uromyces pisi-sativi is well-known for infecting Euphorbia cyparissias - here however you see the fungus on two other Euphorbia species: in this habitat, locally only those two Euphorbiae are present - and of both there exist infected individuals.Infected ones look completely different from non-infected plants, they remain sterile and won't even develop flowering buds; and they all show on the underside of leaves the marks of Uromyces (see second shot).For U. pisi-sativi there's a long list of synonyms - click here, Index Fungorum: Species Fungorum.