The small nail (Armillaria mellea (Vahl) P. Kumm., 1871) is a basidiomycete mushroom of the Physalacriaceae family.
It grows in autumn, bushy, parasitic of stumps and tree trunks, of which it can cause death. The mushroom mycelium is bioluminescent. It is widespread in North America and Europe.
According to authors of the past, this fungus deserves the name of “mushroom asparagus” for the fact that the good part of it is the upper end of the stem together with the cap, while the rest of the stems (especially in adult individuals) is leathery. and very indigestible.