Tilia fungus, Holwaya mucida. This is the asexual reproductive stage called anamorph.

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Keywords: anamorph, ascomycete, asexual, bark, black, caliciiformis, crinula, finland, fungi, fungus, growing, growth, holwaya, log, morph, mucida, mushroom, mushrooms, reproductive, rot, rotting, sac, small, stage, tilia, trunk