[mordechai9000]

Mushrooms Demystified by David Arora

Edit: this is the definitive resource for serious amateur mushroom enthusiasts in North America. It has a wealth of information on understanding the identifying characteristics of mushrooms, as well as keys to aid in the identification of many common genera and species. It's one of those books I find entertaining just to open and read at random. YMMV.

[micro_cam]

This is the Bible. his pocket guide is great as well and much easier to carry. he himself is quite the legend as well.