. 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. Plant diseases; Parasitic plants. 450 BASIDIOMYCETES, The two species are held by many autliors to be identical. It occurs chiefly on stems of beech, also on oak and birch. In regard to its parasitism nothing further is known. Polyporus (Fomes) annosus Fr. (Trametes radiciperda Hartig^) (Britain and America). The sporophores vary much in form, according as they occur more above or more below ground on tree stems, or on tim
. 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. Plant diseases; Parasitic plants. 450 BASIDIOMYCETES, The two species are held by many autliors to be identical. It occurs chiefly on stems of beech, also on oak and birch. In regard to its parasitism nothing further is known. Polyporus (Fomes) annosus Fr. (Trametes radiciperda Hartig^) (Britain and America). The sporophores vary much in form, according as they occur more above or more below ground on tree stems, or on timber in mines. The upper surface is brown and marked in zones, the margin being lighter. The section through the woody sporophore is white. The hymenial layer is also white. Spores ovoid and colourless, germinating easily in water. In artificial cultures, Brefeld states- that they produce only Fig. 281.—Polyporus. annosus Fr. (Trametes radiciperda Hartig). Stool of a forty-year Spruce, which has been dead for two or three years. The sporophore is several years old. a, a, White open-pored layer forming over the dead basidial layer, b, b; at c a narrow strip of wood still remains firm, the remainder is completely destroyed and rotten. (After R. Hartig.) This species was first investigated in detail by Ii. Hartig,^ and is described by him as the most dangerous of all parasites in the conifer forest. It is most frequent on Conifers, pine, Weymouth pine, spruce, silver fir, Douglas fir, balsam fir, juniper, and Thuja; it also occurs on various broad-leafed trees, beech ^ and hawthorn. ^R. Hartig, Zersefzungserscheimaigen, PI. Wichtige Krankheiten, PI. III. Ztif-schri/t f. Forst-und Jagd-ivesen, 1889, p. 428. Botan. Centralblaf/f XLii., 1890. -Brefeld, Schimmelpihe, Heft 8, 1889. * Rostrup, Afbildning og Beskrivelse af de farligste Snylteiivamfe, Please note that these images are extracted from scanned page images that may have been digitally enhan
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectparasit, bookyear1897
