Doassansia borealis Farlow, 1883

on Sagittaria

gall

Up to 10 mm large leaf spots, with bark brown spore balls discernable as minute dark spots. A spore ball, 80-90 x 100-250 µm, consists of a central mass of spores, surrounded by 1-3 layers of small, thick-walled, flattened sterile cells.

host plants

Alismataceae, monophagous

Sagittaria natans.

references

Brandenburger (1985a: 699), Vánky (2012a: 116).