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The page below is a sample from the LabCE course Fungal Infections in Humans. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Microsporum canis macroconidia are spindle-shaped, rough, and taper to a knoblike end. Each contains >6 cells, separated by transverse septae.
The top right image shows an M. canis culture. The bottom right image shows M. canis in a lactophenol cotton blue preparation showing large, spindle-shaped macroconidia.
36. CDC/Georg. Image #15475. This Petri dish culture plate contained an unknown growth medium, upon which grew a single colony of the dermatophytic fungal organism, Microsporum canis. This was a typical strain, which gave rise to a wooly textured colony. PHIL public domain. Created 1970. Accessed January 14, 2023. https://phil.cdc.gov/Details.aspx?pid=15475
37. CDC/Georg. Image #15472. Under a magnification of 475X, this photomicrograph revealed some of the ultrastructural morphology exhibited by the fungus Microsporum canis. Of note, are the large, multicellular, spindle-shaped macroconidia. PHIL public domain. Created 1964. Accessed January 14, 2023. https://phil.cdc.gov/Details.aspx?pid=15472

36. Microsporum canis growth on agar.
37. Lactophenol cotton blue prep of Microsporum canis demonstrating large, spindle-shaped macroconidia.