. Comparative morphology of Fungi. Fungi. Fig. 380.—Phragmidium Potentillae-canadensis. Development of the primary uredin- ium. 1. Fertile cells, , have cut off sterile cells, 2. Fusion. 3. Formation of spore mother cell, , from basal cell, 4. First nuclear division in the spore mother cell. 5. The spore mother cell has divided into a spore, Sp, and stalk cell, 6 to 8. Lateral budding of the basal cell to a new spore mother cell. 9. Two mature urediniospores from the same basal cell. (After Christman, 1907.) the aecial stage, there is no plasmogamy before the formation
. Comparative morphology of Fungi. Fungi. Fig. 380.—Phragmidium Potentillae-canadensis. Development of the primary uredin- ium. 1. Fertile cells, , have cut off sterile cells, 2. Fusion. 3. Formation of spore mother cell, , from basal cell, 4. First nuclear division in the spore mother cell. 5. The spore mother cell has divided into a spore, Sp, and stalk cell, 6 to 8. Lateral budding of the basal cell to a new spore mother cell. 9. Two mature urediniospores from the same basal cell. (After Christman, 1907.) the aecial stage, there is no plasmogamy before the formation of the initial cells. Forms in which the aecium closely resembles the uredinium are sometimes said to lack the aecium and the first sorus, except pycnia, is then called the primary uredinium, while the later uredinia, resulting from its spores, are called secondary uredinia. As far as these forms have been investigated, plasmogamy and further development occurs as in a caeoma (Figs. 380, 381), , in such forms as Triphragmium Ulmariae (Christman, 1907; Olive, 1908; Kursanov, 1922; Lindfors, 1924), Phrag- midium Potentillae-canadensis (Olive, 1908), Uromyces Alchemillae, Puccinia obtegens (Kursanov, 1922) and probably also in Kuehneola albida. 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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