. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. CYSTOPUS. 125 Besides conidia, spherical oospores may also be present ; these are generally produced on the stems of the host-plant, but also on Hower-stalks and ovary-walls. The spherical conidia arise in simple chains on short coni- diophores, and are loosely connected by tiny intermediate cells. The conidial cushions rupture the epidermis and the ripe conidia fall oft' to produce biciliate swarming cells (Fig. 34).
. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. CYSTOPUS. 125 Besides conidia, spherical oospores may also be present ; these are generally produced on the stems of the host-plant, but also on Hower-stalks and ovary-walls. The spherical conidia arise in simple chains on short coni- diophores, and are loosely connected by tiny intermediate cells. The conidial cushions rupture the epidermis and the ripe conidia fall oft' to produce biciliate swarming cells (Fig. 34). These give rise to oemi-tubes which enter the stomata of seedlings and. Fio. :i6.—Flower of Radish hypertrophied by Ct/stopi's The white swollen conidial cushions occupy the enlarged petals, sepals and ovaries. (Dr. Bruns' phot.) develop to intercellular mycelia, fine short lateral twigs of which pierce the wall of the host-cells and become little spherical haustoria. The oogonia arise as thick-walled spherical swellings on the mycelium. The antheridium, after applying itself to the oogonium, widens and projects a fine fertilization-tube through the wall to the egg-cell. After fertilization is effected, the egg-cell is enclosed in a firm uneven membrane, and hibernates inside the oogonium. In spring the plasma of the oospore forms numerous biciliate. 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 Tubeuf, Karl, freiherr von, 1862-1941. London, New York [etc. ] : Longmans, Green & co.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi
