A slime mold, Arcyria ferruginea, grows on dead wood in Hertfordshire, UK. Despite their common name, slime molds are not fungal, and are in fact an amoeba-like organism that clumps together in large structures.
by Will Atkins

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A slime mold, Arcyria ferruginea, grows on dead wood in Hertfordshire, UK. Despite their common name, slime molds are not fungal, and are in fact an amoeba-like organism that clumps together in large structures.
by Will Atkins
Arcyria sp. and a springtail by Barry Webb
... 8 hours later:
This is Arcyria cinerea much beloved of various small, creeping things, and me also. <3
Arcyria denudata slime mold
Photo by Robert Thompson
I brought home this white slime mold three days ago. I had to figure out how I could transport it home without damaging it, since it was still transitioning out of its plasmodial state and was therefore still very soft, like jello that hasn't set.
After a day, it turned this burnt red color. (Fingernail for scale)
And today, on day 3, I see that it is Arcyria (denudata?). The spore-bearing threads have formed and spores are ready to be released to the wind.
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Arcyria species by Barry Webb.
Arcyria insignis