T.E.R:R.A.I.N - Taranaki Educational Resource: Research, Analysis and Information Network

Gymnopilus (Genus)

Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Agaricales
Family: Cortinariaceae
Genus: Gymnopilus

Gymnopilus is a genus of gilled mushrooms within the fungal family Strophariaceae containing about 200 species. Their spores are warty (under the microscope) and are of a rusty brown/orange colour. Their spore dust frequently coats everything within a few centimetres of the mushroom.

The photos below are of a mushroom with a 25mm cap with a rough surface. They were growing on old hardwood post lying on the ground.
Might be Gymnopilus purpuratus?.

Thanks to Wikipedia for text and information: https://creativecommons.org/licenses/by-sa/3.0/