I am in New Zealand on the North Island where very little grain is grown, and straw is usually sold by pre-order before harvest. But I do have my local tree guy dump truck-loads of wood chip in my pasture.
This includes some fruit trees, but mainly ornamentals, including a lot of New Zealand natives - and often a mix of trees in the one dump. New Zealand natives are usually a soft-leaf evergreen, as we are in a climate where is is light winter frosts, but not enough to kill the grass, as most land is so close to the coast. I think they are often also a hardwood.
I have read bits about what type of wood will grow oyster mushrooms and so far have gleaned the following bits of information:
YES - hardwoods, oak, deciduous
NO - fruit trees, pines/conifers
What I am wanting to know is the theory behind it. Or to make it more simple - if a mushroom grows on the wood, is it OK? E.G, do they not grow on pinewood, or if you grew it on pine would will it give a bad taste to the mushrooms?
Basically, can I go out to each pile that does not smell of pine/conifer resin and steam a trial batch, and if spawn grows on it, then I know I have a winner pile, and I save it for growing mushrooms?