the.com/velvet foot

means A common name for Flammulina velutipes, the winter mushroom, whose slender stems have a fine velvety down especially near the base — unlike the smooth, slick caps most mushrooms wear.

from Straightforward descriptive naming: 'velvet' from Old French velvet/veluotte, rooted in Latin villus meaning shaggy hair or tufted down, and 'foot' for the mushroom's stem (a common folk-mycology habit of calling the stipe a 'foot'). Put together, the name simply reports what the fingers find — a stalk furred like velvet where it meets the wood it grows on.