Found a little add for Pro Forest Bar and Chain Oil, which is a nontoxic lubricant made of 80% canola oil. It extends bar, chain, and sprocket life, and most of it biodegrades in 21 days. Can get it at www.husqvarna.com/us
I bet if you took some of that canola-based bar & chain oil, grab some fresh mushrooms from the forest and toss them in the oil for a few hours (or just do a big sporeprint) and shake it, you might just have some inoculum ready to roll.
When it is used for evil, then watch out! When it is used for good, then things are much nicer. Like this tiny ad: