Most fungi books have some errors, but the only book i have seen that has lethal errors is edmund geinwieder. All information should double checked, if you are going to eat a wild plant. My favorite wild food book at the moment is roger phillips wild food, but i know it was written in the 1970's, and there is now a better understanding of long term toxic effects, which wasn't available when it was written. Europeans spent 400 years happily chugging away on tobacco before we understood it gave us cancer. I saw on TV the other day someone happily cooking comfrey fritters, yet comfrey causes cancer as do fiddlenecks.
What I am getting at in my opinion their isn't one book. I have proper field guides to ID plants and fungi, i have cook books, and most importantly I have cooper johnsons poisonous plants in britain and their effects on animal and man. I don't carry a libary with me I just practice alot. For example there is yellow rowan fruits growing in a near by park, the only way I will find out if they make rowan sauce is to make rowan sauce with them, there isn't another way to find out.