Wikimedia
Wikipedia: Fungus
Wikipedia provides detailed information on fungus, including a classification chart and hyperlinked table of contents.
Ohio State University
Osu General Plant Biology: Fungi
This is a summary article that explains what a fungus is and how it survives. There is a good section on the economic importance of fungi.
University of Guelph
Introduction to Invertebrate Biodiversity: Fungi
Find out more about fungi when you check out this comprehensive site. This resource provides an introduction and information on morphology, reproduction and the importance of fungi. Don't miss out on this fascinating source.