| MadSci Network: Microbiology | 
Yes. It is a fungi that is part of the organisms we call microorganisms. What you see growing on trees is a mass of microscopic filaments.
Kingdom: Fungi
 
Phylum: Basidiomycota
 
Class: Homobasidiomycetes
 
Order: Polyporales
 
Family: Ganodermataceae
 
Genus: Ganoderma
 
Try the links in the MadSci Library for more information on Microbiology.