>>911201>>911206There's loads of small mycological clubs and societies-- virtually everywhere with a decent mushroom season will have at least one. Failing that, there's always NAMA.
Join one and go on forays. Practically all of the people there will be over 50, know local edibles, and be happy to share their knowledge with you. Seriously, this is the way to get started. You will learn more from a day in the field with someone who knows their sight IDs and basic taxonomy than you will from a month with a book.
That being said...
All good guides will be region-specific. I'm NorCal / PNW, so I recommend
All That the Rain Promises and More (David Aurora)
Mushrooms Demystified (David Aurora)
Mushrooms of the Redwood Coast (Christian Schwarz and Noah Seagle)
California Mushrooms (Desjardan, Wood & Stevens)
shit I tell everyone who insterested in eating wild mushrooms:
Learn the deadly poisonous ones as well as the edibles. The life you save might be your own. Learn hunting etiquette. Be respectful of the forest.