Photograph of Ceratocystis fagacearum (oak wilt fungus) endoconidia
All Photo credits from publication: Steve Cook, Cook Company, St. Paul, MN Sandra Gould, U of MN, Plant Disease Clinic Rich Hauer, MN Department of Agriculture, Photo Archive Jill Pokorny, USDA Forest Service, St. Paul, MN Stephen Stenger, Kunde Co., Roseville, MN
USDA-FS Publication: How to collect field samples and identify the oak wilt fungus, <a rel="nofollow" class="external free" href="http://www.na.fs.fed.us/spfo/pubs/howtos/ht_oaklab/laboratory.htm">http://www.na.fs.fed.us/spfo/pubs/howtos/ht_oaklab/laboratory.htm</a>