. Comparative morphology of Fungi. Fungi. Fig. 213.—Sclerotinia Urnula. 1. Young conidial chain. 2. Older stage showing fundaments of disjunctors. 3. Mature conidial chain. 4. Germinating conidium with germ tube beginning to sprout. (X 345; after Woronin, 1889.) detaches in the middle (mutatis mutandis, somewhat as in Albugo) a small conidial plug (Fig. 213). Both plugs form a fusiform body, thedisjunctor. Hence the connection between the conidia has become very loose. When they are touched by insects they cling to them and thus reach the stigmas of their host. Here they germinate to mycelia w
. Comparative morphology of Fungi. Fungi. Fig. 213.—Sclerotinia Urnula. 1. Young conidial chain. 2. Older stage showing fundaments of disjunctors. 3. Mature conidial chain. 4. Germinating conidium with germ tube beginning to sprout. (X 345; after Woronin, 1889.) detaches in the middle (mutatis mutandis, somewhat as in Albugo) a small conidial plug (Fig. 213). Both plugs form a fusiform body, thedisjunctor. Hence the connection between the conidia has become very loose. When they are touched by insects they cling to them and thus reach the stigmas of their host. Here they germinate to mycelia which, like pollen tubes, penetrate the stylar canals and ovaries, even to the surface of the berries and change them to longitudinally ribbed, brownish, sclerotic mummies. These mummies fall to the ground and winter over. Directly after a thaw, the erupting ascigerous fructification bears an apothecium as broad as 1 to cm. on a 2- to 10-cm. long brown stipe, hairy at the base. The ascospores are shot out with great force and, in case they reach the young shoots of the billberry, develop to the above described mycelium. We find a similar life cycle, especially a similar rhythmic change between moniliform spores provided with disjunctors and apothecial. 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.
Size: 1324px × 1887px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookpublishern, booksubjectfungi
