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A recent observation on iSpot has finally solved the 'Star Jelly Mystery' that has been running possibly for centuries. We have had quite a few observations of a mysterious jelly that appears in odd places and contending explanations of what it might be.
There is an example observation and some of the associated debate here.
The observation that solved the mystery, showing a picture of the jelly associated with obvious remains of frogs/frogspawn is here
Frog or frogspawn remains probably account for a lot of the mystery observations, but some of them will be other organisms such as:
A fungus that grows on wood, such as Exidia nucleata (Crystal brain)
Slime moulds, such as Mucilago crustaceae
Algae, such as Gloeocystis
Blue green bacteria, such as Nostoc
You can now hear an interview that Jonathan did on Saving Species about Star Jelly here:
For the backstory see this BBC Scotland report