Black mass of tiny granules that collapse on touching (see detail) Covered in slug trails.
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Some fungi are very poisonous so a mistaken ID could have serious consequences.
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These masses were up to 20cm across and on an old poplar stump. Would that fit?
I have never seen it that size myself but it does say that it spreads over the surface of the trunk so maybe the start to fuse together.I am not that experienced in this type of fungi so hopefully one of the expert's will help.I cannot think that it could be anything else,the poplar stump would fit as it is a broad leaved tree it prefers Birch but will occasionally grow on other Broad leaved tree's.I hope this help's you it is rather a wide subject but very interesting and I am also quite new to this subject.
Lat/Lng: 53.8156, -1.2275
OS grid ref: SE509357