Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] 243 DISEASES OF CULTIVATED PLANTS leaves, and more especially the sheathing portions, are seen to be more or less covered with rounded or elongated patches, covered with a delicate greyish-white mycelium, and bordered with brown. These patches often spread entirely over the sheath. When the fungus has reached this stage of development, the lower leaves are dead and the entire plant Fig. 69. —I, Gibellina cenalis on wheat plant, nat. size; 2, ascuh with spores of same, highly
Diseases of cultivated plants and Diseases of cultivated plants and trees diseasesofcultiv00massuoft Year: [1910?] 243 DISEASES OF CULTIVATED PLANTS leaves, and more especially the sheathing portions, are seen to be more or less covered with rounded or elongated patches, covered with a delicate greyish-white mycelium, and bordered with brown. These patches often spread entirely over the sheath. When the fungus has reached this stage of development, the lower leaves are dead and the entire plant Fig. 69. —I, Gibellina cenalis on wheat plant, nat. size; 2, ascuh with spores of same, highly mag ; 3, Ophiobolus graminis, on wheat plant, nat. size ; 4, perithecium of same, mag ; 5, spores of same, highly mag. dying, so that the car does not escape from the sheath, or at best is but imperfectly developed. At this stage numerous perithecia are developed on the leaves, leaf-sheaths, and internodes of the stem on those portions previously occupied by the greyish mycelium, but are usually most abundant, and often confined to the inner surface of the leaf-slieaths. Perithecia globose, sunk in the tissue of the host, neck pro-
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