large fungus with very lumpy yellow and brown cap

large fungus with very lumpy yellow and brown cap

Observation - large fungus with very lumpy yellow and brown cap - UK and Ireland. Description: Observed this fungus on 28th September when it had a smooth pale orange surface. Today (12th October) had grown to a diameter of approximately 8 inches, with yellow, cloud-shaped lumps on the surface and edges, and brown moss-like areas. Gills non-linear.

Observed this fungus on 28th September when it had a smooth pale orange surface. Today (12th October) had grown to a diameter of approximately 8 inches, with yellow, cloud-shaped lumps on the surface and edges, and brown moss-like areas. Gills non-linear. Hopefully all clear from photos. Growing from the ground in a cleared area in mixed deciduous woodland.
Have looked through my field-guides without success. Anyone know what it is?