Gymnopilus flavidellus is a species of mushroom in the family Hymenogastraceae.

The cap is 2 to 5 centimetres (0.8 to 2.0 in) in diameter.

[1] Gymnopilus flavidellus grows on coniferous and deciduous wood, such as stumps, buried wood, fallen limbs, and sawdust.

It can be found in most of temperate North America, fruiting from autumn to winter.

[1] List of Gymnopilus species