. 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 brassicac, Wor.) Oabljage-seedliiigs 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 tlieir 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.—Ch>jtHdiwn b
. 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 brassicac, Wor.) Oabljage-seedliiigs 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 tlieir 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.—Ch>jtHdiwn brassicae, Wor. Cell containing 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. { = Synchytrivrii trifolii, Pass.) Produces deformation of the leaves and petioles of Trifolimn repens. The fungus lives in the epidermal cells. Olpidium lemnae, Fisch., in epidermal cells of Lcmna. Olpidium simulans, De Bary and Wor., in Taraxacum officinale. A number of other species inhabit algae, spores, fungus- mycelium, pollen-grains, and eggs of Rotatoria. The genera Rcessia, Pscudolindium, Olpidiopsis, FIcotrachclus, Ectrogclla, 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 1 Woronin, Pringsheini's Jahrhuchf. iciss. Botauil; 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. London, New York [etc. ] : Longmans, Green & co.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi
