MYCOCINOGENY IN THE GENUS BULLERA: ANTI-TREMELLACEOUS YEAST ACTIVITY OF KILLER TOXIN PRODUCED BY BULLERA HANNAE

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The type strain of Bullera hannae produces a thermolabile protease-sensitive fungicidal toxin that was specified as mycocin. This killer toxin did not act against ascomycetous, sporidiobolaceous and ustilaginaceous yeasts. Its killing pattern is restricted to tremellaceous yeasts and includes the species of Fibulobasidium, Filobasidium, Holtermannia, Sirobasidium, Trimorphomyces, and Tsuchiyaea. The members of the genera Bulleromyces, Cystofilobasidium, Mrakia, Sterigmatosporidium, and Xanthophyllomyces were insensitive to this mycocin. The anamorphic genera Bullera, Cryptococcus, Fellomyces, Kockovaella, Trichosporon, and Udeniomyces were heterogeneous in this respect. The taxonomic significance of the sensitivity to the mycocin of B. hannae is discussed.