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on Populus

gall

urediniospores pear-shaped, spinulose, but with a smooth zone near the equator; here often the wall pf the spore is somewhat thickened.

uredinia, telia

Salicaceae, monophagous

Populus balsamifera, carolinensis, nigra & var. italica, tremuloides.

notes

North American species, found at some occasions in mostly southern Europe. In France it is a quarantaine species (Wikipedia, 2016a).

references

Brandenburger (1985a: 38), European and Mediterranean Plant Protection Organization (2009a), González-Fragoso (1922a, 1925a), Klenke & Scholler (2015a), Vialle, Frey, Hambleton, Bernier & Hamelin (2011a).