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).