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Happy New Year! Looking for a confirmation that this might be Tremella mesenterica (Witches’ Butter, Golden Jelly Fungus, etc.).
Found on a young deciduous tree (pos. birch) in a small plantation. From what I have read, Tremella mesenterica is usually found on dead wood, and in association with a Peniophora crust fungus. Apparent in some of the photos (especially the third) is a crust fungus – which, stupidly, I didn’t take much notice of at the time. The orange hanging bit is presumably part of it which has dried.
As it was on a nature reserve, and the only fungus I found of interest, I didn’t take anything for a spore print.
Thanks for any help.
Hello Nick and a HNY to you too Yes, no problem with
Tremella mesenterica. The only other possibility is T. aurantiawhich is parasitic on Stereum hirsutum. Now you know of the association with Peniophora spp. you will take notice of it in the future 
It’s interesting to note the pallid areas of your fungus – which supports comments made by Peter Roberts in his paper on the two British yellow
Tremellaspp. in Mycologistvol.9(3) pp.110-14: “
Pallid fruit bodies have sometimes been giventhe name
Tremella lutescens, but there is nothing to suggest the existence of a third yellow
Tremellaspecies in Europe, and
T. lutescensis now regarded as a
nomen dubium, probably synonymous with T. mesenterica. White, unpigmented or albino fruit bodies have sometimes been given the
names
Tremella albidaHuds.: Fr. or Tremellacandida
Pers. Both are nomina dubia.” best wishes
Chris
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