I don't know for sure but I posted about it a few months ago. I used fire place patch to fill in an over reamed bowl and if I didn't smoke it for a while it started doing this. I sanded it down and let it be and now it looks like this. I haven't smoked it, I just let it set in a drawer and now it's really going to town. Started like this, and now... well as you can see above, it's gotten bigger.
Oh boy...
That's an E. vampirium toxic mold bloom coupled with a lethal percentage of X. zombieform killsyourassus.
Just "set it in a drawer" is exactly what the stuff wants you to do. It expands at night, and grows in the direction of carbon dioxide exhalation sources. Meaning it will slowly crawl up your nose and into your throat and lungs while you are sleeping.
But it gets worse... It becomes hyper-activated after sensing that its intended victims have become aware of it, and then travels several feet per second.
Meaning, in the time it took you to read this, it got you.
Sorry man. Mother Nature don't play nice, sometimes.
The good news is the zombie phase when it gets into your brain doesn't start for 10-12 hours, so you still have time to send all your pipes and tobacco to Kevin, who will be glad to distribute it to the rest of the board.