Okay
@natureboygrower &
@mistergrafik, my opinion is that we shouldn't be going into protected areas and gathering shit up. Luckily here we have a lot of suburban nature trails/parks and further out lots of public lands that people only use in the fall to hunt in.
Keep in mind that this is for inoculation purposes and just an attempt to ultimately increase the diversity of life in our grow medium, so a lot isn't needed. If there is food (and there better be!) then at least some of the new bacteria and fungi introductions will prosper. All healthy forests in my region are fungal dominated, and in rotten wood you'll likely be inoculating mainly fungi rather than bacteria. That's not a bad thing, because fungi is critical to biological recycling of high carbon biomass in your grow - especially the lignin component of it. The bacteria move in later to clean up the mess left behind.
I should mention that you will not be introducing mycorrhizal fungi by introducing rotten wood, because these fungi live in soil associated with living roots. Plus in the forest, even if you do get the nice black stuff filled with root hairs instead of wood, it will probably be ectomycorrhiza (not really useful to us) rather than the endomycorrhiza fungi we want. Luckily you can find at least dozens of species of endomycorrhiza in any fertile garden soil that has been growing healthy plants for a few years. This is what makes outdoor garden or even field soil a great inoculant, plus it balances forest inputs because it will be highly bacterial dominant. Being the cautious person I am, I'm scared of introducing nasties into my grow so that kind of soil is always cycled through my worm bins first before introducing it into my tent. Keep in mind that if you didn't have springtails, predatory and detritus eating mites, and even isopods in your worm bin before, you'll probably have them after the introduction. And that's okay, they're beneficial. Natural organic growing isn't for the squeamish. lol
So yeah, I see nothing wrong with introducing rotten wood as long as you don't introduce ants into your house. I know for sure my wife would complain.