. Fungous diseases of plants, with chapters on physiology, culture methods and technique . 2o6 FUNGOUS DISEASES OF PLANTS Klebahn in his investigations of this fungus ascertained thatwhen the leaves are wintered over under suitable conditions ofmoisture an ascigerous stage is developed the following stage proved to be a Pseudopeziza; that is to say, aPseudopeziza was one of the most abundant of the perithecialstages found on wintered leaves. The spores of other perithecialforms yielded upon inoculation of the growing leaves no result,whereas spores of the Pseudopeziza developed in
. Fungous diseases of plants, with chapters on physiology, culture methods and technique . 2o6 FUNGOUS DISEASES OF PLANTS Klebahn in his investigations of this fungus ascertained thatwhen the leaves are wintered over under suitable conditions ofmoisture an ascigerous stage is developed the following stage proved to be a Pseudopeziza; that is to say, aPseudopeziza was one of the most abundant of the perithecialstages found on wintered leaves. The spores of other perithecialforms yielded upon inoculation of the growing leaves no result,whereas spores of the Pseudopeziza developed in due course of. Fig. 79. Anthracnose on Currant Leaf. (Photograph by F. C. Stewart) time the Gloeosporial stage upon growing parts. The ascigerousstage develops as a small fungous body of rapidly growing tissue,completely immersed in the leaf, and more or less surrounded bythe old hyphae of the Gloeosporial form. With further develop-ment the epidermis is ruptured and the apothecium opens as afleshy disk-shaped structure, the basal portions of which consistof more or less pseudoparenchymatous tissue from which arisenumerous asci and paraphyses. The basal portion remains inpart surrounded by thick-walled cells of the old mycelium, as ASCOMYCETES 207 shown in Fig. 80, b. The asci are club-shaped and bear eighthyahne ovoidal spores. The paraphyses are simple or branched,sometimes once-septate and slightly club-shaped. This fungus shows in pure culture certain growth characteristicswhich seem to differentiate it somewhat sharply from other speciesof Gloeosporium. In the first place it grows slowly upon n
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