Phylum: Basidiomycota Family: Strophariaceae
Hypholoma fasciculare (Huds.) P. Kumm.
Common on dead wood, often buried, usually in large groups and impressive clumps. Yellow with degrees of orange mainly towards the centre. Crowded adnate gills, greenish-yellow turning darker with age
Knudsen & Vesterholt (2012 second edition) - Funga Nordica
Breitenbach & Kranzlin - Fungi of Switzerland