. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 126 PHYCOMYCETES. swarm-spores which escape from the enclosing coats and germinate on seedling plants. De Bary * found germ-tubes of Cystopus entering all the stomata of Zepidium sativum and of Capsella, but they only developed further if the part attacked were the cotyledons. Magnus^ observed an infection of Raphanus Baphanistriim in which the unopened buds were infected by swarm- spores. Oogonia may be found in th
. Diseases of plants induced by cryptogamic parasites : introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae . Plant diseases; Parasitic plants; Fungi. 126 PHYCOMYCETES. swarm-spores which escape from the enclosing coats and germinate on seedling plants. De Bary * found germ-tubes of Cystopus entering all the stomata of Zepidium sativum and of Capsella, but they only developed further if the part attacked were the cotyledons. Magnus^ observed an infection of Raphanus Baphanistriim in which the unopened buds were infected by swarm- spores. Oogonia may be found in the flowers of this same plant, whereas conidia alone only are present in Capsella. White rust is most commonly observed on Capsella, causing slight local swelling or marked hypertrophy. It is also found to injure radish {Raphanus satimis), horse radish (Cochlearia arnioracia), cress (Zepidium scotivum), species of cabbage and turnip (Brassica Napus, B. nigra, B. Eapa, B. oleracea), wall-flower (Cheir- anthus Cheiri), water cress (Nasturtium amphibium, etc.), caper-plant (Capparis spinosa), and other wild and culti- vated plants belonging to, or closely allied to the Crueiferae. Wakker^ investigated the changes brought about on a number of Cruei- ferae by Cystopus. Some plants showed little or no deformation or anatomical alteration, others showed much. While the anatomical changes in the various species examined agreed in general, yet some showed a predominant or exclusive formation of conidia, others of oospores. The changes. Fig. 37.—Cystopus portulacae, D. C. 771, mycelium; /, basidia; c, spores with intermediate cells. (After Tulasue.) ' Morphology and Biology of the Fungi. English Editiou. '' Abhand. d. botan. Vereins d. Prov. Brandenburg, xxxv. ' Pringsheirn's Jahrbuck, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resem
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