I remember having a book about unexplained mysteries as a kid, and it had an article about "pwdre ser" (Welsh for "rot of the stars"), which is generally the same phenomenon as the "star jelly" that Howard mentioned. The authors emphasized paranormal origins for this substance and the other subjects in the book, but even in my more credulous days I guessed there was probably some biological explanation for this. I had almost forgotten about the old pwdre ser stories until now. The only inconsistency with those stories and the current salamander observation is that some pwdre ser stories claim that it evaporated quickly. Any unexplained gelatinous stuff may have been called pwdre ser, such as slime molds, fungi and other more ephemeral things, as well as these amphibian secretions.
We are lucky that Karan and Jim were so observant and shared these photos! It's fascinating to see the continued growth of the jelly as the salamander's body continues to disappear, and tie it into some old European folklore at the same time. What I want to know is how long the jelly will last and if it will get any bigger, since it seems to have incredible antimicrobial and hygroscopic properties. Hopefully some other female salamanders were more successful in their egg-laying journeys!
Lisa Millbank