. Comparative morphology of Fungi. Fungi. Fig. 92.—Schizosaccharomyces odosporus. Copulation and development of asci. (X 750; after Guillermond, 1903, 1905, 1917.) and replaced by pseudogamy. This also disappears, and the cells, after unfruitful attempts at copulation, may change parthenogenetically to asci or, without this attempted copulation, may develop asci directly and vegetatively. In the other Schizosaccharomyceteae, sexuality and spore formation degenerate still further. Thus in S. Pombe, the yeast of a negro beer, and in S. Mellacei, a yeast occurring in the rum factories of Jamaica,
. Comparative morphology of Fungi. Fungi. Fig. 92.—Schizosaccharomyces odosporus. Copulation and development of asci. (X 750; after Guillermond, 1903, 1905, 1917.) and replaced by pseudogamy. This also disappears, and the cells, after unfruitful attempts at copulation, may change parthenogenetically to asci or, without this attempted copulation, may develop asci directly and vegetatively. In the other Schizosaccharomyceteae, sexuality and spore formation degenerate still further. Thus in S. Pombe, the yeast of a negro beer, and in S. Mellacei, a yeast occurring in the rum factories of Jamaica, numerous asporogenous strains are known and in S. asporus, the yeast of arak manufacture in Java, no spores are known. While in the Schizosaccharomyceteae, the fertilization has become chiefly isogamous, in the Saccharomyceteae there appears a tendency to heterogamy and pedogamy. The simpler forms, as Zygosaccharo- myces Barkeri (Barker, 1901), Z. Priorianus and Willia anomala (Guiller- mond, 1911a), like Schizosaccharomyces odosporus, may be connected. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gäumann, Ernst Albert, 1893-1963; Dodge, Carroll William, 1895-. New York [etc. ] McGraw-Hill Book Company, Inc.
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