The caps are ochre-yellow or tawny brown, scattered with fine yellow scales with darker tips.  The stipe has a bulbous base. There is a short-lived white cobwebby ring at the top of the stipe, reminiscent of a Cortinarius species. 

other Armillaria species: Dark Honey fungus Armillaria ostoyae and Honey fungus  Armillaria mellea.  (In the past it has been considered to be a variety of A mellea, but is now treated as separate species)

Photograph from top down, in side view and from underneath to show gills and full length of stipe.  Note habitat and substrate.

On woodland litter, dead stumps and buried rotting wood of broad leaf trees.

June to November.

Widespread but never particularly common in Britain.

Occasional in Leicestershire and Rutland.

https://www.first-nature.com/fungi/armillaria-gallica.php