The fungi of the Dermocybe group, commonly known as Skin-heads, form a group within the huge genus Cortinarius. They are generally considered to be a subgenus though some authorities consider them to form a genus in their own right.
They can be distinguished from other Cortinarius species by:
An example with a vivid green colour is Dermocybe austroveneta. Another example is D. semisanguinea (pictured), which from above is an ordinary brown colour, but which shows a striking blood-red sheen when the underside of the cap is viewed.
The Austrian Professor Dr. Meinhard Moser (1924-2002), whose book is referenced, was one of the authorities who promote Dermocybe to the status of a genus.