MadSci Network: Microbiology |
Doctor Fungus! - www.doctorfungus.com/
Be certain to ask them if you can use any of their images on your science fair poster. Not only is it polite to do so, you could be infringing on their copyrights to use their images without their permission.
The image search function at Google can also be used to locate fungal images. Try a query of microscopic fungal.
Good luck with your project.
Try the links in the MadSci Library for more information on Microbiology.