Abstract
The life cycle of the heterobasidiomycete, Sirobasidium magnum Boedijn, is described in artificial media. The haploid yeast phase, which may propagate by ballistospores, shows a modified tetrapolar mating system similar to that of Tremella Dill, ex Fr. The possible relationship to the imperfect yeasts Bullera Derx and Cryptococcus Kutzing emend. Phaff et Spencer is discussed.

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