I never knew that there were so many mushrooms. I always wondered why people worried about what was edible or not. During an about 2 hour scrounge through the Cedar River Watershed, in Washington, US, we found a collection of about fifty types. We actually had another container with all the larger mushrooms, too. We went as a group and afterwards, we found there was very little duplication, some, but not entirely. The one factoid I remember from the hour lecture was that tree health relies on fungus' in the dirt. There were many more.
Here's the link to the Cedar River watershed webpage for more information about classes such as this one:
Expect to find hikes, birding, history and more...including rain drums!