. Botany for agricultural students. Plants. Fig. 325. — At the left, surface of a leaf infected with Powdery Mildew, showing the superficial mycelium, ascocarps, and conidiophores. At the right, a cleistothecium broken open, showing the asci which develop within. From Tulasne and Nature. globular heavy-walled cleistothecia in which the asci are produced and which, when mature, appear to the naked eye as black dots on the surface of the leaf {Fig. 325). Projecting from the wall of the ascocarp are appendages which may have variously branched tips. Enclosed within the heavy wall of the ascocarp,
. Botany for agricultural students. Plants. Fig. 325. — At the left, surface of a leaf infected with Powdery Mildew, showing the superficial mycelium, ascocarps, and conidiophores. At the right, a cleistothecium broken open, showing the asci which develop within. From Tulasne and Nature. globular heavy-walled cleistothecia in which the asci are produced and which, when mature, appear to the naked eye as black dots on the surface of the leaf {Fig. 325). Projecting from the wall of the ascocarp are appendages which may have variously branched tips. Enclosed within the heavy wall of the ascocarp, the ascospores pass the winter. When freed in the spring by the breaking of the ascocarp, the spores may be blown or carried about and germinate upon a new host. The development of the ascocarp is a result of fertilization and the sex organs, like those of Pyronema, suggest those of the Red Algae. The ascocarp of the Mildews suggests the cystocarp of the. 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 resemble the original Martin, John N. (John Nathan), b. 1875. New York, John Wiley ; London, Chapman & Hall
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplants, bookyear1919
