Deep mushrooms are so dusty. Knock one too hard and you're covered in the stuff and sneezing blue glow into your handkerchief the rest of the day. Ugh, but nothing I ever worked with was as bad as rashvine nettle. I'm sure you've something like it in your world - you know, the thing you only pick up without gloves on once before your learn your horrible, itchy lesson?
As for the name...honestly, it was better than some of the other things men in a shop will call an elven girl, so I sort of missed it when they stopped. Glow-worm was better than knife-ear or sugartits.