The "slime" on the lower part of the stem gives them their other common name which is the Slimy Bonnet.
Some sources seem to suggest that the fruiting bodies can give off bioluminescence. I've tried looking at them in the dark, but can't say I've ever seen any evidence of this? (Have you Philip?)
Most of the records (any many of the Fieldguides) list them under their old name which Mycena rorida.