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Some fungi are very poisonous so a mistaken ID could have serious consequences.
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B aereus is not one I have seen often but it has a dark cap often with paler patches as this but the stem is described as dark brown with concolorous reticulum which doesn't really fit with yours so not sure.
"stem is described as dark brown with concolorous reticulum which doesn't really fit with yours so not sure"
I don't understand, I thought this does show this pattern.
To me this looks to have a light brown stem with a darker reticulated network on top rather than the stem and the reticulations being the same colour.
I see what you mean.
However looking at a load of B. aereus photos on the web they do tend to show the kind of stem that mine has. Incidentally quite a few of the images that show up as B. aereus on simple web search clearly are not B. aereus.
One other characteristic not mentioned is that it tasted a bit different to B. edulis, and with a texture more creamy or towards some of the slimy suillus, not unpleasant but just not quite the same as edulis and not something I have tasted before.
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