Ciboria batschiana, known as Ciboria fungus or catkin cup fungus, growing from oak acorn in Finland

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Photo credit: © Henri Koskinen / Alamy / Afripics
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Keywords: acorn, apothecia, autumn, batschiana, black, catkin, ciboria, cup, cup-shaped, disc-shaped, disco, discos, fall, finland, fructigenus, fungi, fungus, hymenoscyphus, mushroom, nut, oak, pathogen, plant, rot, september