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I think I can help with the Latin.
In the first paragraph 'palpis pedibusque flavis' means 'with the palps and legs (feet) yellow', so 'his' (the latter) refers to the legs, which are brown-spotted.

The subject of the last paragraph is definitely M. boletina. ' Similar to M. ornata as an egg to an egg, but...'

So you are right.

Stephen.