Hey all!

I am growing oyster mushroom on straw and would like to know if I can use the spent mushroom (the mushroom mycelium on straw after it's been harvested) as a part of the digestor feed or even only rely on that?

I know the mycelium growth releases enzyme that breaks down the cellulose so I figured it might be easier to digest. 

I am mainly not sure if the straw is harmfull in that it would dry the digestor out.