. 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 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
. 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 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 l^e 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., 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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