MYCOCINOGENY IN THE GENUS BULLERA - ANTI-TREMELLACEOUS YEAST ACTIVITYOF KILLER TOXIN PRODUCED BY BULLERA-HANNAE

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