Abstract
This chapter studies the genus Cyrenella. This monotypic genus includes an unusual cystobasidiomycete with conidia with broadly diverging branches resembling those of aquatic hyphomycetes, i.e., Ingoldian fungi. In the determination of asexual reproduction it is seen that yeast cells are ovoid or elongate and reproduce by multilateral or polar budding. Unicellular obovate, thin-walled conidia with narrow, divergent, flexible, apical appendages are also formed. True hyphae with clamp connections and spherical to ovoid teliospores are produced. Ballistoconidia are not formed. In sexual reproduction it is found that formation of a basidium from teliospore germination has not been observed. Therefore, Cyrenella is considered to represent an anamorphic genus. The chapter also discusses physiology/biochemistry and phylogenetic placement of the genus. The type species taken and the species accepted is Cyrenella elegans. In the systematic discussion of the species, growth on 5% malt extract agar, Dalmau plate culture on corn meal agar, gene sequence accession number, type strain, origin of the strain studied, systematics, and ecology are determined.
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