. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 448 BASIDIOMYCETES. pinuum Bresadola or P. fulvus Scop, of E. Hartig). Sporophores on silver fir, less commonly on spruce. Their form varies much, according as they occur on a branch or on the stem. In the former case, the sporophore forms a swelling below and on each side of the more or less horizontal branch. On the stem they are more or less bracket-like. The sporophores are reddish brown with a smooth upper surf
. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 448 BASIDIOMYCETES. pinuum Bresadola or P. fulvus Scop, of E. Hartig). Sporophores on silver fir, less commonly on spruce. Their form varies much, according as they occur on a branch or on the stem. In the former case, the sporophore forms a swelling below and on each side of the more or less horizontal branch. On the stem they are more or less bracket-like. The sporophores are reddish brown with a smooth upper surface on which zones are only faintly indicated or altogether absent. Internally they are of a brownish or tawny colour, and exhibit concentric strata, which do not extend into the pore-layer; they are thus distinguished from sporophores of P. iffniarius and others. The sporophores are very frequent on cankered stems of fir where the canker-spots afford easy entrance for the spores. The wood-destruction consists in a white-rot. The wood becomes yellowish- white with clear spots and fine dark lines, especially where in contact with healthy parts. The mycelium is yellow- ish, and consists of thick hyphae with. »4 â¢-â -.â¢â¢i,"-^A Fig. 279.âPolyporus Hartigii. Destruction of wood of Silver Fir. The decayed wood is yellow, but shows dark points and black lines, (v. Tubeuf phot.) lateral branches forming tangled masses which frequently fill up the cavity of the bordered pits. This mycelium gives off very fine branches which bore through the cell-walls and dissolve them in such a way that the middle lamellae disappear first and leave the remainder of the wall- thickening for a time isolated before it too is used up. In this way large holes are formed in the elements of the wood. Polyporus sistotremoides (Alb. et Schw.) (P. Schweinitzii Ft. or P. mollis Fr. of E. Hartig)'- (Britain). Sporophores almost circular with a short thick central stalk; while young they are ligh
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi
