Can you eat a mushroom that looks familiar?

MycoWiki answer

Can you eat a mushroom that looks familiar?

No, not because it looks familiar. A dangerous species may share an outline, colour or habitat with a sought-after one, while the same mushroom can change appearance with age or moisture. Examine the complete specimen and verify several matching characters in a reliable source, especially those that rule out relevant lookalikes. Reject the hypothesis when an important feature is missing or conflicts with the guide. Folk tests, taste, animal feeding or cooking do not prove safety. In Switzerland, have a VAPKO service inspect any wild collection intended for a meal. If any doubt remains, exclude the mushroom from consumption.