Which funghi is this?

Which funghi is this?

Observation - Which funghi is this?. Description: Single funghi found growing from trunk of fallen tree in mixed woodland of beech, elm and sycamore.

Single funghi found growing from trunk of fallen tree in mixed woodland of beech, elm and sycamore. The log it was on was, I think, elm - though it was hard to determine because of the degree of decay.
The woodland is at Loch Libo nature reserve in East Renfrewshire.
The funghi has a viscid cap with faint striations at the edges, which are slightly wavy.
The cap was marginally convex, with a bright yellow outer darkening toward the centre.
The funghi was only around an inch across.
The stipe was cylindrical and markedly darker than the cap or gills, which are shown in the second picture as being a dark creamy colour, I think free or adnate and quite distant and of differing lengths.
There is no ring on the stipe, nor a volva at the base.
I'm very new to mycology so I'd be thrilled if someone can help me identify this.