Any mycologists in here?

I need an expert on fungi. There are several clumps of a kind of boletus in my garden, some near a holly but all near or under an oak. I know most types of boletus are at least edible, and many, such as porcini, very good, but I don't want to come up against one of the few nasties. The cap is dry, brown and cracked, the stem thin and cream-coloured, gradually pinkish-brown towards the "root", and the pores greenish-yellow, turning blue-black when damaged.

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