Mushrooms are fascinating - just to be plain about it. This little book was full of all sorts of interesting tidbits: the fruiting body (the mushroom) has no more cells on the day you pick it than when it first erupted from the underground fungi body - it's just that the cells are swelling with water. Isn't that cool?
I won't spoil anymore of the book. There's basic info on what we know/understand of the life cycle of mushrooms, how and why some are toxic, the history of finding and labeling mushrooms, difficulties in growing mushrooms commercially, and more stuff.
If you don't know much about mushrooms, but are interested, this is a great book to start with.