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 POLYPORUS. 445 surface, and a smooth yellowish hymenial surface. They are large and flat, the thickest part being at their insertion (Fig. 277). Several frequently occur on the same stem, especially if wounds or frost injuries are present. The spores are brown and roundish. Conidia are said, by Schroeter, to be formed on the upper surface of the sporophores. This species is a deadly enemy of fruit-tre
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 POLYPORUS. 445 surface, and a smooth yellowish hymenial surface. They are large and flat, the thickest part being at their insertion (Fig. 277). Several frequently occur on the same stem, especially if wounds or frost injuries are present. The spores are brown and roundish. Conidia are said, by Schroeter, to be formed on the upper surface of the sporophores. This species is a deadly enemy of fruit-trees, especially apple. In the vicinity of Munich the sporophores are common on ash. Schroeter gives elm and plane as hosts, and Prillieux _{:S-«=.j3= â» m ''â''Yi'i W â 'rtt',- â'''â¢MuBw,, Fig. 277.â hl-j . L acction through a living stem of Ash, and a sporophore of P. hifjjcdux. The stem shows symptoms of wood- destruction, in that it becomes brown and has short white longitudinal and radial stripes, (v. Tubeuf phot.) and Delacroix state the fungus to be very dangerous to the mulberry in France. It causes brown discoloration of the wood accompanied by characteristic short white lines in both radial and vertical directions, so that the wood becomes marked out in squares. Polyporus (Poria) laevigatus Sporophores dark-brown 1 Prillieux (Bullet, de la Soc. mycolog. de France, ix., 1893), gives details of the destruction of the wood. -Mayr, Botan. Centralblatt, xix., 1884.
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