. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. PEEIDERMIUM. 415 branch, the living portions of the ring grow on with increased vigour, and even attempt to close over the injured portion. This irregular growth, continued in many cases for years, pro- duces abnormal cross-sections (Fig. 248). The mycelium grows out centrifugally from diseased spots, so that the wounds continue to enlarge, and the disease becomes easily noticeable on account of the deep channels an
. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. PEEIDERMIUM. 415 branch, the living portions of the ring grow on with increased vigour, and even attempt to close over the injured portion. This irregular growth, continued in many cases for years, pro- duces abnormal cross-sections (Fig. 248). The mycelium grows out centrifugally from diseased spots, so that the wounds continue to enlarge, and the disease becomes easily noticeable on account of the deep channels and distorted swellings on the pine branches and stems. As the disease spreads inwards into the stems, the conduction of water is interfered with and the branches above such wounds dry up and die off. Whereas. Fia. 2i7.—Peridci-mium pini (cai-Hcola). a, a, Mycelial stroma developed in the rind; the host-cells have become isolated from each other and contain haustoria, h, of the fungus, b, Basidia composed of much smaller cells than in the needle-inhabiting aecidia. jp, The peridium. (After R. Hartig.) young plants soon succumb to attack, the struggle with old trees may go on for years. Fresh infection of older stems occurs generally in the higher parts of the tree, where the bark is still thin. Pycnidia (spermogonia) are developed between the rind- parenchyma (periderm) and cork, generally towards the margin of diseased spots. The conidia emerge from the ruptured cork-layers of the bark as a honey-sweet liquid. H. Mayr states that this liquid is given off in such quantity from species of Peridermium in Japan, that it is collected and eaten by the 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, Green &
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