This Petri dish culture plate contains a growth medium of Sabouraud dextrose agar (SDA), which had been inoculated with the fungal organism, Sporotrichum schenckii, also known as Sporothrix schenckii, strain M-36-53. This wrinkled colony displayed a characteristically leathery, moist appearance. Its coloration ranged from beige-yellow at it periphery, to a darker, brownish-purple in its more central, older areas.
“Sporotrichosis is an infection caused by a fungus, Sporothrix schenckii. The fungus lives throughout the world in soil, plants, and decaying vegetation. Cutaneous infection is the most common form of infection and usually occurs after handling contaminated plant material, when the fungus enters the skin through a small cut or scrape.”
For more on the subject of sporotrichosis, please see the link below.