Darkly pigmented cultural forms of Trichophyton rubrum (Cast.) Sabouraud produce on Sabouraud's agar an antimycotic substance effective against Cryptococcus neoformans, C. diffluens and Torulopsis stellata. The active substance has not yet been isolated.
Frágner P. (1965): Die mykostatische Wirkung von Trichophyton rubrum auf Kryptokokken. – Česká Mykologie 19(2): 111–113.