I played with this on agar for a minute thinking I had bacteria, but I believe the leading edge on agar shows wispy growth before filling in.
I lost my one strawbag with all of my spawn as it wasn't fully sealed. Dumped all my spawn to one bag because it was colonizing grain so slowly.
Here's round two of spawn in the making, learned not to put all my spawn in one basket...
Thinking it's time to hit the spore print as none of this growth is as vigorous as I like, but then again I hear it's related to the slow colonizer P. semilanceata