Here are various links to websites with more information about mushrooms.

Alan Muskat (No Taste Like Home)
Asheville's famed philosoforager, aka, The Mushroom Man, offers wild foods outings "off the eaten path." Participants learn about mushroom medicine, dyeing with mushrooms (that's D-Y-E), and more through poetry, stories, wit and wisdom. Co-founder of The REAL Center, Muskat sees foraging as a spiritual path, a way to see that we're continually provided for and never alone.
AmericanMushrooms.com
David Fischer’s site – Co-author of  Edible Wild Mushrooms of North America: A Field-to-kitchen Guide (1992, Univ. of Texas Press) and Mushrooms of Northeastern North America (1997, Syracuse University Press).
Mushroomexpert.com
Michael Kuo's website includes extensive information on morel hunting, plus topics on toxic mushrooms, tree identification, and studying mushrooms.
Mushroom Mountain
Explore many fascinating aspects of fabulous fungi at Mushroom Mountain. A great web resource for teachers, students, mushroom hunters, and growers featuring many videos and instructions on how to cultivate edible mushrooms in the garden. Workshops and lecture dates are also scheduled throughout the year. 
NAMA
North American Mycological Association. Our Asheville Club is a affiliated with this non-profit organization of amateur and professional mycologists with more than 60 affiliated local mycological clubs throughout North America. NAMA’s mission is "to promote, pursue, and advance the science of mycology."
For more about NAMA and how to join, please click here.
NCmushrooms.org
The purpose of the North Carolina Mushroom Growers Association, Inc. is to increase mushroom consumption through the promotion of the culinary and health benefits of North Carolina farm grown mushrooms. In addition, our organization seeks to provide educational and networking opportunities to build and support the emerging mushroom industry in our state
Roger’s Mushrooms
Roger's twenty-year study will make the site the most complete collection of photographs and mushroom information from both sides of the Atlantic ever assembled.  There are  over 3000 images on the site to help you identify and learn more about the mushrooms of North America of Europe
Taylor Lockwood
Mushroom photographer who now has 2 outstanding photo books to his credit.
Tom Volk’s U of Wisconsin LaCrosse Fungi site
Tom Volk is the Professor of Biology whose site has numerous mushroom photos, and a very extensive tour into The Kingdom Fungi.
University of Tennessee Herbarium Fungus Database
17,400 Searchable records from Great Smoky Mountain National Park.
Wood Decay Fungi
Keys, photographs, and descriptions of macroscopic fungi utilizing wood as a substrate in the Northeast United States. By Gary Emberger and Messiah College.