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I've found some Ganoderma applanatum with galls this autumn, including one on Betula (Sept. 08, Zosimova Pustyn station, Naro-Fominsk district, Moscow region) where the galls looked pretty fresh. Since the adults will hopefully emerge only next spring, I decided to check whether anybody's home. I opened a single gall (random choice) and there it was, looking very much like on pictures in Chandler (2001, p. 133, Figs 150-153).
First, the galls again.