Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplant00tube Year: 1897 10 THE PARASITIC FUNGI. Others, like rodoq)ha('ra castcu/7ici, they take the form of broadened closely-clinging hyphae with haustoria. Frank describes a swell- ing of the germ-tube of Fusidadinm trcmulae just before the infecting hypha pierces the cell-walls of its host. A similar phenomenon can be observed in Poly stigma ruhrum, in Gnomonia crythrostoma, and in the germinating aecidiospores of Mdamps
Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplant00tube Year: 1897 10 THE PARASITIC FUNGI. Others, like rodoq)ha('ra castcu/7ici, they take the form of broadened closely-clinging hyphae with haustoria. Frank describes a swell- ing of the germ-tube of Fusidadinm trcmulae just before the infecting hypha pierces the cell-walls of its host. A similar phenomenon can be observed in Poly stigma ruhrum, in Gnomonia crythrostoma, and in the germinating aecidiospores of Mdampsora Goejypcrtiana. Some other examples will le mentioned in our next section. Haustoria of the epiphytic Parasites. The most inconspicuous haustoria are those of Herpotrichia nigra and Trichosj)haeria varasitica, described by E. Hartig. Flo. 2.—Haustoria of Trichosphaeria }arasilica. (Details on Fig. 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 Lehrhurh d. Baiimhrankheiten, II. Aiifl. English translation by Professor Somerville. Macmillan & Co., 1894.
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