- A buff-coloured woodland toadstool with a greasy cap, found in both Eurasia and North America and typically growing in tufts and often in rings.
More example sentences
- Collybia butyracea, family Tricholomataceae, class Hymenomycetes
- They sell maitake, shiitake, oyster, lion's mane, chestnut, scallops and butter cap mushrooms in 1/2 pound sacks for $6 and one pound sacks for $10.
- Little grilled quails with spring butter caps and giblet sauce.