''Mycena olida'', commonly known as the rancid bonnet, is a species of mushroom in the family

Mycenaceae The Mycenaceae are a family of fungi in the order Agaricales. According to the ''Dictionary of the Fungi'' (10th edition, 2008), the family contains 10 genera and 705 species. This is one of several families that were separated from the Tricholom ...

. It was first described in 1887 by Italian mycologist

Giacomo Bresadola Giacomo Bresadola ( Mezzana, Trento; often given as Giacopo) 14 February 1847 – Trento 9 June 1929) was an eminent Italian mycologist. Fungi he named include the deadly '' Lepiota helveola'' and ''Inocybe patouillardii'', though the latter ...

Description

The cap, initially conical to convex in shape, flattens out with age and typically reaches diameters of up to .

References

{{Taxonbar, from=Q6946904 olida Fungi described in 1887 Fungi of Europe Taxa named by Giacomo Bresadola