>White oak (those with lobed leaves) and other fast growing hardwoods appear
>to be the preferred food for shiitake. Another key to choosing which species
>to try is the amount of tannic acid. Trees high in tannic acid tend to
>support better crops of mushrooms.
I used to keep a shortwood crew busy cutting white oak bolts for a mushroom
grower. He specifically wanted white oak cut in 4 foot lengths (about 4-6"
diameter), but he was willing to pay a premium price for it.