Russula - many varieties
Grow in symbiosis with a variety of types of trees - as a Mychorrhizal mushroom, they are not available as spawn or spores, you'll need to cultivate and experiment if you want to attempt to grow them. Characteristically brittle mushroom, this is one of the defining qualities in a Russula.
They dry and pickle well.
Many are under study for a range of potential medicinal benefits.