. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. 296 ,. celia, may develop to myceliu; of eonidia i« uukiiuwn. In nutritive solutious eonidia are formed in large numbers, and multiply ycast-liki' till nutriment fails. Ust. succisae Magn.^ frequents the anthers of Scabiosc Suaisa, and forms pure white spores, easily distinguished from those of the two preceding species. The anthers appear to Ije thickly covered with glassy granules. The spo
. Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae. Plant diseases; Parasitic plants; Fungi. 296 ,. celia, may develop to myceliu; of eonidia i« uukiiuwn. In nutritive solutious eonidia are formed in large numbers, and multiply ycast-liki' till nutriment fails. Ust. succisae Magn.^ frequents the anthers of Scabiosc Suaisa, and forms pure white spores, easily distinguished from those of the two preceding species. The anthers appear to Ije thickly covered with glassy granules. The spores produce four-celled promycelia from which eonidia are formed. (Britain.) Ust. tragopogonis (Pers.) (Britain). Tliis fungus forms its .spores in tiowers of species of Trarjopogoyi, and in many localities has a wide distribution. The development of the flower is retarded, so that it retains externally the appearance of a flower-bud en- closed in its bracts (Fig. 161). The dark-brown or violet spores escape through intervals between the bracts; they are 13-17/>i long, 10-15/u liroad, with reticulate markings on their coats. They easily produce in water four or five-celled promycelia from which eonidia are given otf, often followed by coalescence. In nutritive solutions development is much more vigorous, secondary eonidia may be produced, and coalescence always takes place. Ust. scorzonerae (Alb. et Schwein.) is at first sight very similar to Ust. fragopogonis. Its spores are found in fiowers of Scorzoncra humilis, Sc. purpurea, and cultivated species, Sc. hispanica; while its mycelium hibernates in the perennial root-stocks of these. The spores are produced rapidly and in large numbers; they germinate easily in water, forming a four-celled promycelium, and thereafter eonidia which do not pair. Ust. cardui Fisch. v. Waldh. (Britain). This is the cause of a stunting of the flower-heads of Cardmcs aeanthoidcs, C. nutans, and Silyhum Marianum, while at the same time they
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi
