The powder-blue of this crust was actually remarkable!
The last log turned over to check for fungi this afternoon showed these patches of this powder-blue(?) delicate and slightly fluffy crust, partly on the decaying leaves pressed to the log's underside rather than the wood itself. The log was certainly well rotted but not yet disintegrating, and most likely to be oak. The blue was greyer in places. The crust resembled one of the three species of Byssocorticium in Hugill and Lucas, possibly atrovirens, but not separable without microscopy of the spores, etc. The colour was really quite impressive and a delightful sight as the light faded, a wonderful end to our afternoon in the local woodland, whatever the species.
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