Diseases of plants induced by Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith diseasesofplants00tubeuoft Year: 1897 10 THE rAKASITlC FLNGI. Others, like Podospharra castagnci, they take the form of broadened closely-clinging hyphae with haustoria. Frank describes a swell- ing of the germ-tube of Fusicladium tremidae just before the infecting hypha pierces the cell-walls of its host. A similar phenomenon can be observed in Polystigma rubrum, in Gnomonia erythrostovui, and in t
Diseases of plants induced by Diseases of plants induced by cryptogamuc parasites; introduction to the study of pathogenic fungi, slime-fungi, bacteria, and algae. English ed. by William G. Smith diseasesofplants00tubeuoft Year: 1897 10 THE rAKASITlC FLNGI. Others, like Podospharra castagnci, they take the form of broadened closely-clinging hyphae with haustoria. Frank describes a swell- ing of the germ-tube of Fusicladium tremidae just before the infecting hypha pierces the cell-walls of its host. A similar phenomenon can be observed in Polystigma rubrum, in Gnomonia erythrostovui, and in the germinating aecidiospores of Mclampsora Gocppevtiana. 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 TricJio-ydirteria vnrasitica, described by E. Hartig. Flo. 2.—Haustoria of Trickosnhaeria parasitica. (Details on Fifr. 88.) (After R. Hartig.) 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, swells inside to a simple or branched sac, the haustorium. The Lehrburh if. lianmh-anlcheiten, II. Aufl. English translation by Professor iSonierville. Mucniillan & Co., 1894.
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