Submitted to: Yeasts: A Taxonomic Study
Publication Type: Book / Chapter
Publication Acceptance Date: December 14, 2009
Publication Date: March 21, 2011
Citation: Kurtzman, C.P. 2011. Discussion of teleomorphic and anamorphic Ascomycetous yeasts and yeast-like taxa. In: Kurtzman, C.P., Fell, J.W., Boekhout, T., editors. The Yeasts, a Taxonomic Study. Volume 2, 5th edition. New York, NY: Elsevier. p. 293-307. Technical Abstract: The relationship of ascomycetous yeasts with other members of the ascomycete fungi (Ascomycota) has been controversial for over 100 years. Because yeasts are morphologically simple, it was proposed that they represent primitive forms of ascomycetes (e.g., Guilliermond 1912). Alternatively, the idea arose that yeasts represent morphologically reduced forms of more evolved taxa. In keeping with this idea, Cain (1972) suggested that hat-shaped (galeate) ascospores are evolutionarily unique and signaled a relationship between hat-spored yeasts, such as Pichia and Cephaloascus, and the hat-spored ‘higher ascomycetes’ (Pezizomycotina), such as Ceratocystis. Redhead and Malloch (1977) and von Arx and van der Walt (1987) accepted this argument and comingled yeasts and mycelial taxa in their treatments of the Saccharomycetales (Endomycetales) and the Ophiostomatales.