Sporotrichosis is caused by Sporothrix schenckii, a dimorphic fungus in the family Ophiostomataceae. S. schenckii is a yeast in tissues or in culture at 37oC, but grows as a filamentous mold at room temperature culture or in the environment.
Iowa State University
Iowa State University Center for Food Security and Public Health, "Sporotrichosis" (2006). Center for Food Security and Public Health Technical Factsheets. 124.