. Comparative morphology of Fungi. Fungi. PERISPORIALES 199 ity is degenerating; in some species the sexual act still occurs, in others it is absent and the ascogonia develop parthenogenetically; in still others, as in Sphaerotheca Humuli, the behavior varies according to circumstances. Fig. 126.—Phyllactinia corylea. 1. Coiled copulation branches. The male nucleus has divided to form a stalk cell and antheridial cell. 2. Antheridium completely divided into stalk cell and antheridial cell. 3. Plasmogamy. 4. Caryogamy. 5. Outgrowth of primary ascogenous hyphae. 6, 7. The binucleate penultimate
. Comparative morphology of Fungi. Fungi. PERISPORIALES 199 ity is degenerating; in some species the sexual act still occurs, in others it is absent and the ascogonia develop parthenogenetically; in still others, as in Sphaerotheca Humuli, the behavior varies according to circumstances. Fig. 126.—Phyllactinia corylea. 1. Coiled copulation branches. The male nucleus has divided to form a stalk cell and antheridial cell. 2. Antheridium completely divided into stalk cell and antheridial cell. 3. Plasmogamy. 4. Caryogamy. 5. Outgrowth of primary ascogenous hyphae. 6, 7. The binucleate penultimate cell of the primary ascogen- ous hypha (the ultimate cell is in the next section). 8, 9. The penultimate cell develops secondary ascogenous hyphae. (These figures represent successive, serial sections of the same hypha.) 10, 11. Young fructifications, the former .showing ascogenous hyphae, the second young asci. (1 to 4, 8, 9 X 670; 5, 6 X 250; 4, 7, 10 X 330; 11 X 200; after Harper, 1905.) and the ascogonia may continue their development with or without fertilization. According to the type of the further development, the fertilized or the unfertilized ascogonium grows while the antheridium collapses to a. 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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