. Comparative morphology of Fungi. Fungi. HYPOCREALES 231 ground. Between the long, multinucleate, male and the long, uninucleate, female cell, there is formed a pore (Fig, 148, 2) and one of the many male nuclei migrates into the female cell. Then the pore is closed (Fig. 148, 3) and the nuclei remaining in the male cell gradually degenerate. Not only the ascogonium but also the surrounding vegetative cells show an increased vitality, probably because of stimulation of the sexual act. They begin to change to rafter-like, super-imposed paraphyses, while the ascogonium dies, except for the sing
. Comparative morphology of Fungi. Fungi. HYPOCREALES 231 ground. Between the long, multinucleate, male and the long, uninucleate, female cell, there is formed a pore (Fig, 148, 2) and one of the many male nuclei migrates into the female cell. Then the pore is closed (Fig. 148, 3) and the nuclei remaining in the male cell gradually degenerate. Not only the ascogonium but also the surrounding vegetative cells show an increased vitality, probably because of stimulation of the sexual act. They begin to change to rafter-like, super-imposed paraphyses, while the ascogonium dies, except for the single cell with its m Fig. 149.—Poly stigma rubrum. 1. Part of mature ascogonium from which trichogynes extend to the left above and below. 2. Continuation of lower left trichogyne of 1. 3. Further continuation of the trichogyne of 2. (Note the renewed branching.) (X 860; after Nienburg, 1914.) By forcing aside these paraphyses, the perithecial cavity, filled by para- physes, is formed. During January the ascogenous hyphae grow into the cavity and change to asci. In March the development of the ascospores is completed. This life cycle of Poly stigma rubrum is generally interpreted according to the relations of the lichens to be discussed later in the Discomycetes, that the pycnia are spermogonia, and the structures here designated as pycniospores (and they are certainly very difficult to germinate) as functionless spermatia which earlier may have fertilized the 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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