Betula nana: upperside and underside of a galled leaf, and section of the erineum; from Roivainen (1950a).

gall

Wine-red erineum, mainly at the base of the leaf and along the veins. Hairs irregularly mushroom-shaped.

hostplants

Betulaceae, narrowly monophagous

Betula nana.

notes

the difference with the gall of Acalitus longisetosus in unclear.

references

Buhr (1964b), Coulianos & Holmåsen (1991a), Farkas (1965a), Fjelddalen (1995a), Roivainen (1950a), Wahlgren (1963b).

17/11/2014