. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 10 THE PARASITIC FUNGI. others, like Podosphaera castagnei, they take the form of broadened closely-clinging hyphae with haustoria. Frank describes a swell- ing of the germ-tube of Fuskladium tremulae just before the infecting hypha pierces the' cell-walls of its host. A similar- phenomenon can be observed in Polystigma rubrum, in Gnomonia erythrostoma, and in the germinating aecidiospores of Melampsora Goeppertiana
. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 10 THE PARASITIC FUNGI. others, like Podosphaera castagnei, they take the form of broadened closely-clinging hyphae with haustoria. Frank describes a swell- ing of the germ-tube of Fuskladium tremulae just before the infecting hypha pierces the' cell-walls of its host. A similar- phenomenon can be observed in Polystigma rubrum, in Gnomonia erythrostoma, and in the germinating aecidiospores of Melampsora Goeppertiana. Some other examples will be mentioned in our next section. Haustoria of the epiphytic Parasites. The most inconspicuous haustoria are those of Herpotrichia nigra and Trichosphaeria parasitica, described by R Hartig.^. Fio. 2.—Haustoria of Ti-ichoaphaeria parasitica. (After R. Hartig.) (Details on Fig. 88.) They are tiny hyphal processes resting on the host-epidermis, and sunk into the outer walls of the epidermal cells, so as to pierce the cuticle but not the whole wall (Fig. 2, d, e; also Fig. 90). The Erysipheae are typical epiphytes, which weave a mycelium over the surface of plants they attack; the mycelium retains its hold by adhesion-discs or appressoria, and from certain parts of these a fine thread-like process is given off, which, after piercing the epidermal wall of the host, sweUs inside to a simple or branched sac, the haustorium. The '^ Lehrhuch d. Baumkrankheiten, II. Aufl. English translation by Professor Somerville. Macmillan & Co., 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 & co.
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