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 450 BASIDIOMYCETES. The two species are held Ity many authors to be identical. It occurs chieHy on stems of beech, also on oak and birch. In rer;ard to its ])arasitisiii notliinii fnrtlici- 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 timb
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 450 BASIDIOMYCETES. The two species are held Ity many authors to be identical. It occurs chieHy on stems of beech, also on oak and birch. In rer;ard to its ])arasitisiii notliinii fnrtlici- 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 2 that they produce only conidia. Fio. 281.âPolyporun annosus Fr. (Trametes radiciperda Havtig). Stool of a forty-year Spruce, which has been dead for two or three years. The sporophoi e several years old. «, a, White open-pored layer forming over tlie dead basidial layer, h, h; at c a narrow strip of wood still remains fii'm, the remainder is completely destroyed and rotten. (After R. Hartig.) This species was first investigated in detail by K. Hartig, and is described by him as the most dangerous of all parasites in the conifer forest. It is most frequent on Conifers, cjj. 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, Zerset-Amriserschfiinnnijtn, PI. WichtUjf. Krankheiten, PL III. Zei/.'rhri/t f. Fork-xind Jaifd-iveaen, 1889, p. 428. Botan. CentrcJUatl XLii., 1890. â Brefeld, Schimmelpihe, Heft 8, 1889. ' Rostrup, Afhildniini oij Beskrivelse af de farluiMe Snylte-numpe, 1889.
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