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November 1927


Author Affiliations

Fellow of the Royal College of Physicians, London; Professor of Tropical Medicine, Tulane University, New Orleans; Visiting Lecturer, London School of Hygiene and Tropical Medicine and University of Porto Rico; Director of Tropical Medicine, Ross Institute, London; Emeritus Professor of Tropical Medicine, Ceylon Medical School NEW ORLEANS

Arch Derm Syphilol. 1927;16(5):571-604. doi:10.1001/archderm.1927.02380050035005

CLASS II. ASCOMYCETES  These fungi are characterized by their mode of reproduction, viz., by spores originating inside special cells called asci. The spores (ascospores, endospores, gonidia) inside the asci generally number fouror eight or a multiple of eight. While these fungi live a parasitic life, asci are not found, and reproduction takes place by germination and conidia. The fungi belonging to this order are often pleomorphic, their morphologic characters changing according to the medium on which they live.

Classification.—  Ascomycetes are divided into the following subclasses:

  1. Asci with varying number of spores, usually numerous—Hemiascomycetes.

  2. Asci with a definite number of spores.

  • Asci separate or scattered—Protoascomycetes.

  • Asci approximate, usually forming a hymenium—Euascomycetes.

Subclass Protoascomycetes  The subclass Protoascomycetes contains a single order, the Saccharomycetales.

ORDER SACCHAROMYCETALES  This order is divided into two families as follows:

  1. Vegetative cells single or loosely attached in irregular colonies Saccharomycetaceae.

  2. Vegetative cells forming a mycelium Endomycetaceae.

Family Saccharomycetaceae Rees, 1870.

Definition.—  Protoascomycetes with vegetative cells, single or loosely attached in irregular colonies; mycelium not usually developed; asci