I have never seen yellow T. fuciformis - it may get yellowish tint because of dirt or when getting very old. The fungus on your photo is most probably T. mesenterica.The jelly is causing a bit of discussion on my local Fungi Facebook page. My latest guess was Tremella Mesenterica, which a couple people agreed with. The latest suggestion was "Possibly yellow form of Tremella fuciformis. You can see its companion with Xylariales sp". Because I've only ever seen white T. fuciformis ...
You'e probably right about the slime mould - when in doubt ...
Edit - and when I look at your Wiki page - the first image that comes up is Tremella Mesenterica!
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