Mating is observed in Bullera alba and B. variabilis, resulting in the formation of dikaryotic mycelium with clamps, haustorial branches, and lateral and terminal dikaryotic, clavate, lageniform or subglobose cells. These cells develop in B. alba into tremellaceous phragmobasidia. Karyogamy has been observed in young non-divided basidia. Germination of the phragmobasidia occurred by acropetal chains of yeast cells, ballistospores or hyphae. Septal pores are dolipores with parenthesomes made up of U-shaped vesicles (Tremellales type). For the teleomorph of B. alba a new genus, Bulleromyces, is proposed, with only one species, viz. Bulleromyces albus.
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