Chapter 33 - Hyphopichia von Arx & van der Walt (1976)

Abstract

This chapter studies the genus Hyphopichia. In the determination of asexual reproduction, cell division is by multilateral budding on a narrow base. Cells are short, ellipsoidal, or elongate. Pseudohyphae and true hyphae may be formed. Colonies are tannish-white and butyrous to hyphal. In sexual reproduction it is seen that asci may be unconjugated or show conjugation between separate cells or between a cell and its bud. One to four hat-shaped ascospores are formed and are released by ascus deliquescence. One species is heterothallic but the mating system of the other species is unknown. In physiology and biochemistry it is seen that glucose and other sugars are fermented, and many of the sugars and polyols in standard yeast growth tests are assimilated. This study further examines the phylogenetic placement. The type of species mentioned is Hyphopichia burtonii. The species accepted are Hyphopichia burtonii and Hyphopichia heimii. The systematic discussion of the species includes synonyms, growth on 0.5% malt extract agar, growth on the surface of assimilation media, Dalmau plate culture on morphology agar, CoQ, Mol% G1C, gene sequence accession number, type strain, cell carbohydrates, formation of ascospores, origin of the strains studied, complementary mating types, systematics, ecology, biotechnology, agriculture and food, and clinical importance.