[Chalky] Just noticed that I missed a question of yours way back there -- back at a time when every time I tried to post there was another question. :-) Er, anyway, no, it isn't a tree.

Not many edible fungi beyond mushrooms, toadstools, and truffles.

Hmmmmmm... I have tried to answer very carefully, but I think I have still ended up being misleading. The edible part is a specific variety of mushroom, but it is not strictly correct to describe the whole as a mushroom. The whole is a specific variety of fungus, but as I said before it is not sufficient to identify the variety.

[Raak] Continuing my clarification, the answer is a particular fungus, which has as its fruit (spore) an edible mushroom. I would guess that the mushroom is sold in some supermarkets, but I do not think it is commonly found for sale. (By the way, some of my reading has led me to the discovery that fungi are not necessarily classified as either animal or vegetable, but are a class on their own, so we may have to rename the game AVFMA.)

Oh, and it is highly unlikely that you or I would find the edible part for sale in a supermarket, but Dan or Dunx might.