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 462 BASIDI0MYCETE8. scales arranfed regularly in concentric lines. Tlie stools break out from living stems through cracks in the bark or from wounds, ). those made by wood-peckers. The fir-wood, normally white, assumes, when diseased, a yellow or honey-colour, more or less like the sporophore, while here and there, parts may become light brown. The hyphae grow in all direc- tions, but especially as
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 462 BASIDI0MYCETE8. scales arranfed regularly in concentric lines. Tlie stools break out from living stems through cracks in the bark or from wounds, ). those made by wood-peckers. The fir-wood, normally white, assumes, when diseased, a yellow or honey-colour, more or less like the sporophore, while here and there, parts may become light brown. The hyphae grow in all direc- tions, but especially as white strands up and down the year-rings, while others in horizontal and vertical direction break up the wood into irregular patches (Fig. 290). In the final stages of destruction the wood will be found laminated into its separate year-rings and very much broken up into irregular pieces (Fig. ). The sporophores of this Arjaricus are not uncommon protruding from bark- cankers caused by Accidium elntinvm, and its mycelium assists in the destruc- tion of the stem. Fio. 2D2. — Agnricuii (idiposua and Poli/porus Hdrtigii. Destruc- tion of Fir-wood, the boundary of the regions affected by the two fungi is formed by a verj' dark line of demarkation. To the riglit the destruction is that produced by Hiirtigii, to the left by Agaricus adiposuK. (v. Tubcuf phot.) Agaricus (Pholiota) squarrosus (Miill.). On living and dead stems of broad-leaved trees. (Britain.) Ag. (Ph.) destruens (Brond.). On living and dead stems of poplar. (Britain.) Ag. (Ph.) aurivellus (Batsch.). On liv'ing and dead stems of broad-leaved trees. (Britain.) ' FUNGI IMPERFECT!.' The fungi placed here have life-histories which as yet have not been completely investigated, most of them being known only in the form of pycnidia or conidia. The number of species was at one time much larger, but it is gradually being re- duced as the forms are proved to be stages in the life of some species of definite
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