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A collection of over 30,000 photographs of 3,000 species from all kingdoms. A nice thing about it is an embedded Google search within the website. The fungi photos often include pictures of microcharacters such as basidia and cystidia and the species are identified and include the authority. This will be useful when you are verifying species identifications.
Fungi of California originally started, it seems as the website for the Mycological Society of San Francisco. There are only 11 genera of agarics illustrated, but they are long on species with very good descriptions and links to the more specific literature. Lots of photos.
A few Years back Dr. Halling of the NYBG revised the old concept of Collybia, tranfering many of the commons species into Gymnopus, Rhodocollybia, etc. Worth a visit if you are seriously looking at these mushrooms
The best thing about Mushroom expert is Kuo's guide to collecting and studying mushrooms. He goes into everything from how to prepare collection notes, to the use of chemical reagents. He even shows how to "scan" a mushroom. I have not tried to use his keys, but they are there with links to field photos of specific species at various sites, along with his own photos.
Mushrooms of Tokyo has 625 species illustrated. Unlike most, Asahi has included photomicrographs of spores and cystidia for many specimens.
An online and paper journal primarily for the amateur mycologist and mycophagist, but also includes very useful articles and great glossary and dictionary and links to photographic sites including the Yarrow slide collection.
From Denmark, it contains very detailed and sophisticated keys to over 140 agaric genera. This is the site I referred to when I proofread my generic description for this website. It provides even more detailed generic descriptions than are included here.
Taylor Lockwood is the premier photographer of mushrooms. Visit the site, sit back and be prepared to be amazed.
The Eleanor Yarrow slide collection is a collection of field photos from this region made by this amateur mycologist who taught mycology at the New York Botanical Garden.
The Fungi of Poland has links to over 12,000 photographs on a number of websites, mainly European. In addition there are excellent photographs of many (about 750) species. His keys to agarics start with families, so this is a good place to review these characters.
Volk is a professor at the University of Wisconsin La Crosse, so his site is diverse and includes many teaching tools and the always interesting Fungus of the Month. Very entertaining.