A text-book of mycology and plant pathology . Fig. 105.—Septoria leaf spot disease of celery, or celery blight. {After Coons, G. Levin, Ezra, Spec. Bull. 77, Mich. Agric. Coll. Exper. Stat., March. 1916. SPORES,. Fig. 106.—Section through leaf spot of celery blight (Septoria) showing hyphae)in leaf tissue and pycnidium with exuding pycnospores. (After Coons, G. H., andLevin, Ezra, Spec. Bull. 77, Mich. Agric. Coll. Exper. Stat., March, 1916.) 264 MYCOLOGY eludes the fungi which cause the leaf spot of the pear, Septoria pyricola,the late blight of the celery S. petroselini (Figs. 105 and
A text-book of mycology and plant pathology . Fig. 105.—Septoria leaf spot disease of celery, or celery blight. {After Coons, G. Levin, Ezra, Spec. Bull. 77, Mich. Agric. Coll. Exper. Stat., March. 1916. SPORES,. Fig. 106.—Section through leaf spot of celery blight (Septoria) showing hyphae)in leaf tissue and pycnidium with exuding pycnospores. (After Coons, G. H., andLevin, Ezra, Spec. Bull. 77, Mich. Agric. Coll. Exper. Stat., March, 1916.) 264 MYCOLOGY eludes the fungi which cause the leaf spot of the pear, Septoria pyricola,the late blight of the celery S. petroselini (Figs. 105 and 106), the leafblight of the tomato 6. lycopersici and the leaf spot of currants, S. pycnidia in this genus develop under the epidermis of the hostproducing leaf spots. The center of the leaf spot is occupied by the poreof the spheric, black pycnidium. Leptothyrium pomi is an imperfectfungus responsible for the sooty blotch of the apple and otherplants. According to Floyd the same fungus causes the fly speck ofapples. The genus Entomosporium is a small one with closed half-spheric, black pycnidia. The spores suggest an insect in being four-celled, the cells being arranged cross-like with attenuated e
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