Slippery Jack mushroom, also known as the sticky bun. Listed as edible but some people do have allergic reactions to it.
Woodland sorrel. Flowers, leaves and pods can be eaten and have quite a tangy flavour and are sometimes added to salads, or can be chewed as they are said to have thirst-quenching qualities. This has resulted in the leaves being used to make a lemony drink or it may be brewed as a herbal tea, though the flavour is a little dull. Apparently the juice can be used as a substitute for vinegar.
Capelin. A small bony fish of Arctic waters, resembling smelt and with the same cucumber smell when fresh, and treated in the same way as whiting.