wrote in message
oups.com...
I've had a quick look, but I can't see it being a lichen. When I say it
is on the path, I should have said that is on the soil immediately
adjacent to a brick path.

It's just possible that it is some form of polyacrylamide gel. That's the
powder stuff you put in plant troughs and hanging baskets to retain water.
It looks like a jelly and is usually clear.