. The fungi which cause plant disease . Plant diseases; Fungi. 628 THE FUNGI WHICH CAUSE PLANT DISEASE C. apii Fr. Spots amphigenous, subcircular, pale-brown, 4-6 mm. in diame- ter, with a more or less definite elevated margin; conidiophores hy- pophylous, light-brown, fasciculate, con- tinuous or 1 or 2-septate, subundulate, 40-60 X 4-5 n; conidia hyaline obclavate, or almost cylindric, 3 to 10-septate, slen- der, 50-80 xi II. A serious leaf spot is produced on celery, parsnips, etc.'^""'^^ C. beticola ;' ^sa Spots amphigenous, brownish, purple- bordered, becoming ashy cen
. The fungi which cause plant disease . Plant diseases; Fungi. 628 THE FUNGI WHICH CAUSE PLANT DISEASE C. apii Fr. Spots amphigenous, subcircular, pale-brown, 4-6 mm. in diame- ter, with a more or less definite elevated margin; conidiophores hy- pophylous, light-brown, fasciculate, con- tinuous or 1 or 2-septate, subundulate, 40-60 X 4-5 n; conidia hyaline obclavate, or almost cylindric, 3 to 10-septate, slen- der, 50-80 xi II. A serious leaf spot is produced on celery, parsnips, etc.'^""'^^ C. beticola ;' ^sa Spots amphigenous, brownish, purple- bordered, becoming ashy centered; co- nidiophores fasciculate, short, simple, erect, flavous, 35-55 x 4-6 ft; conidia elongate, filiform obclavate, hyaline, multiseptate, 75-200 X n. This fungus, described in 1873, causes a very serious disease of beet producing spots on the leaves. It is common and de- structive in America and Europe. The conidiophores usually, though not always, emerge from the sto- mata from a few-celled stroma and are amphig- enous. They vary in length and septation with age. If in humid atmosphere the spots become hoary, due to spores present. Each capable of germination. The germ tubes infest the host through the stomata. Pure Fio. 427.—Fertile hy- cultures of the fungus may readily be se- &.*betkola.''°1iter Cured by the usual methods. Here the Duggar. myceliiun produces dense matted colonies of deep olive color and a greenish-grey aerial growth but no conidia. Found also on Spinach in 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 Stevens, Frank Lincoln, 1871-1934. New York : Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfungi, bookyear1913
