Fungi clumped on dead wood

Fungi clumped on dead wood

Observation - Fungi clumped on dead wood - UK and Ireland. Description: Big clump emerged overnight on a long-dead slice of Sweet Chestnut wood. Cap about 2-3cms - note the bi-coloured stem, orange then whitish under the cap. No noticeable smell. Ideas? Definitely not Honey fungus and I don't think Sulphur tuft either.

Big clump emerged overnight on a long-dead slice of Sweet Chestnut wood. Cap about 2-3cms - note the bi-coloured stem, orange then whitish under the cap. No noticeable smell. Ideas? Definitely not Honey fungus and I don't think Sulphur tuft either.