Protomyces gravidus Davis, 1907

on Ambrosia, Bidens

gall

lateral, fusiform, smooth swelling on the stem or main leaf veins; initially pale and somewhat transparent, later brownish. In the vascular tissues thick-walled fungal spores are formed.

hostplants

Asteraceae, narrowly oligophagous

Ambrosia artemisiifolia, trifida; Bidens cernuus, frondosus.

references

Klenke & Scholler (2015a), Reddy & Kramer (1975a).