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me mandan el material seco de Galicia (España)

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Yanick BOULANGERBonjourRécolté sur une brindille au fond d'un fo
Camarops on Quercus
Lothar Krieglsteiner,
09-08-2020 07:49

I would have thought this to be C. polysperma, but Quercus would be an unusual substrate. C. petersii is said to grow on Quercus. What are clear differences? I cannot find a good key including all species. Who can help - what have I to do?
The spores are mostly about 6-7/2,5-3,5 µm large. 5 % KOH (I do not have 10 % with me) dissolves a weak greyish (lilaceous?) pigment.
Best, Lothar