Hohenbuehelia atrocaerulea, Black-blue Oyster. A small fungus, which is probably overlooked, but said to be rare, growing on dead wood, in this case, dead Gorse stems. The cap is a velvety brown, 0.5-2cm in diameter, the area closest the attachment having blackish-blue hairs. There is no stipe, but creamy coloured gills beneath the cap.

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