. Comparative morphology of Fungi. Fungi. Fiq. 124.—Sphaerotheca Humuli. Development of perithecia. 1. Young antheridium and ascogonium. 2. The antheridium divided into antheridial cell and stalk cell. 3. Plasmogamy. 4 to 6. Development of fertilized ascogonium. ( X 500; after Harper, 1896.) ascogonium while the other remains behind in the antheridium and degenerates. In a second group, as in Erysiphe Polygoni (E. Martii) on Pisum sativum and Ranunculus acris, E. cichoracearum on Sonchus oler- aceus, Phyllactinia corylea on Corylus Avellana, in Uncinula Salicis on. Fig. 125.—Erysiphe Polygoni.
. Comparative morphology of Fungi. Fungi. Fiq. 124.—Sphaerotheca Humuli. Development of perithecia. 1. Young antheridium and ascogonium. 2. The antheridium divided into antheridial cell and stalk cell. 3. Plasmogamy. 4 to 6. Development of fertilized ascogonium. ( X 500; after Harper, 1896.) ascogonium while the other remains behind in the antheridium and degenerates. In a second group, as in Erysiphe Polygoni (E. Martii) on Pisum sativum and Ranunculus acris, E. cichoracearum on Sonchus oler- aceus, Phyllactinia corylea on Corylus Avellana, in Uncinula Salicis on. Fig. 125.—Erysiphe Polygoni. 1. Primary ascogenous hypha with five nuclei. 2. Longitudinal section through a young perithecium with three asci; the perithecial wall is already differentiated. (X 470; after Harper, 1896.) Populus (all according to Dangeard, 1907) and in Sphaerotheca Humuli var. fuliginea on Melampyrum (Winge, 1911), fertilization is absent and the male nucleus degenerates in the antheridium. Thus in the Erysiphaceae the relationships are apparently the same as in the Plec- tascales. Although the sexual organs are normal morphologically, sexual-. 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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