Isothea rhytismoides (Babington) Fries, 1849

on Dryas

Dryas x suendermannii (cult.), Belgium, Antwerp © Chris Snyers

same leaf, different lighting

gall

2-5 mm large, somewhat swollen, dark red to black leaf spots. Embedded at the upper side lie thick-walled perithecia containing clublike asci.

hostplants

Rosaceae, monophagous

Dryas octopetala, x suendermannii.

references

Blumer (1946a), Brandenburger (1985a: “Isotheca”), Cannon (1996a), Ellis & Ellis (1997a), Mułenko, Sałata & Wołczańska (1995a), Pellicier (2001a).