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The Department of Plant Sciences, the Tennessee Agricultural Experiment Station, and the University of Tennesee collaboratively provide the Mycorrhizal Literature Exchange
Berkeley put together this useful guide to Fungi -- very accessible, yet plenty of detail for the more advanced mycologist/mycophile. I really like that the site is concisely organized.
Killbuck Valley Mushrooms, run by husband and wife Thomas & Wendy Wiandt are featured in this article about foraging and cultivation.