Associated with birch  and other deciduous  trees.  The golden-yellow cap is slimy or sticky and radially fibrillose, the gills are pale greyish-white. The stem is whitish, with the reminas of the veil forming several orange brown ragged stripes or girdles. 

Other yellow Cortinarius

microscope

Identification is very difficult, requiring microscopic examination.  If you have not done this or if the specimen has not been examined by an expert, please submit your record as genus only (Cortinarius); and note habitat

Woodlands with birch and other deciduous trees

August to October in Britain and Ireland.

Widespread but infrequent in Britain.

Infrequent in Leicestershire and Rutland.

https://www.first-nature.com/fungi/cortinarius-triumphans.php