Hymenoscyphus fructigenus (Eikeldopzwammetje (BE) / Nut Cup (EN) / Fruchtschalen-Becherling (DE) / Pézize fructicole (FR) ) is a fungus in the Helotiaceae family. This tiny cup fungus is one of the smallest mushrooms I saw so far, with caps maxing out at 4 mm. The species is saprobic on beech nuts, acorns, hazelnuts (as in this image) and other nuts. It is mostly found growing gregariously or in clusters. The fruiting Body is cup to disc shaped; the disc up to 4 mm across; with a tiny stem that may become elongated; smooth or finely downy on the underside and stem; uniformly whitish to very pale yellow.
Image: Visé (BE) - 11/09/2010
© Johan Dierckx
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