Brian Van Fleet
Pretty Fly for a Bonsai Guy
THe stuff you have collected in your bag IS a fungus, but the fungus isn't called mycorrhizae. It is called a mycorrhizal fungus because it provides the symbiotic relationship between the plant's roots and itself. You can google it or look it up on wikipedia for more info.
Ahh...so "mycorrhizal" is an adjective, describing WHAT the fungus does...rather than what the fungus is...I read that there are many types of mycorrhizal fungi, this clears it up considerably.
Thanks plant_dr!