. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. OLPIDIUM. 107 Olpidium brassicae, (Wor.)^ ( = Chytridium brassicae, Wor.) Cabbage-seedlings die if this fungus finds its way into the tissue at the neck of the root. The spherical sporangia are formed at this place, and their long necks project out of the cells enabling the uniciliate swarm-spores to escape. Eesting-spores with a warty thickened membrane occur in the cells of the Fig. 24.—Chi/ti'idium br
. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. OLPIDIUM. 107 Olpidium brassicae, (Wor.)^ ( = Chytridium brassicae, Wor.) Cabbage-seedlings die if this fungus finds its way into the tissue at the neck of the root. The spherical sporangia are formed at this place, and their long necks project out of the cells enabling the uniciliate swarm-spores to escape. Eesting-spores with a warty thickened membrane occur in the cells of the Fig. 24.—Chi/ti'idium brassicae, "Wor. Cell contaiuing three sporangia, two of which are discharging zoospores; one sporangium is already empty. Resting- spores inside the cells of a cabbage-plant. (After Woronin.) The disease is favoured, by moisture, and restricted by dry surroundings. Ground subject to attack should be planted with crops other than cabbage. Olpidium trifolii, Schroet. {^Synchytrium trifolii, Pass.) Produces deformation of the leaves and petioles of Trifolium Terpens. The fungus lives in the epidermal cells. Olpidium lemnae, Fisch., in epidermal cells of Lemna. Olpidium simulans, De Bary and Wor., in TaraoMcum officinale. A number of other species inhabit algae, spores, fungus- mycelium, pollen-grains, and eggs of Rotatoria. The genera Beessia, Psei(dolpidium, Olpidiopsis, Plcotrachelus, Ectrogella, Pleolpidium are parasitic only on lower plants, especially on algae. SYNCHYTRIACEAE. The whole mycelium divides up into a number of sporangia, which remain together as a sorus. The winter resting-spores ' Woronin, Pringsheim's Jahrhuch f. wiss. Botanik, 1878 (Fig. 31).. 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; Smith, William G. London ; New York [etc. ] : Longmans,
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