Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplants00tube Year: 1897 214 ASCOMYCETES. active vegetation begins about two and a half montlis later than in the plains, i.e. at the beginning of June. The season of mature spores of Sphaerdla is thus delayed till about the middle of August. On 26th September I found at this elevation only a few spots on the larch needles, and on these hardly any conidial cushions. By 28 th September this larch plantation was already und
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Diseases of plants induced by Diseases of plants induced by cryptogamic parasites; introduction to the study of pathogenic Fungi, slime-Fungi, bacteria, & Algae diseasesofplants00tube Year: 1897 214 ASCOMYCETES. active vegetation begins about two and a half montlis later than in the plains, i.e. at the beginning of June. The season of mature spores of Sphaerdla is thus delayed till about the middle of August. On 26th September I found at this elevation only a few spots on the larch needles, and on these hardly any conidial cushions. By 28 th September this larch plantation was already under snow.' ' It will thus be seen, tliat while at a high elevation the larch can flourish with a vegetative period extending only to three and a quarter or four months, the Spliacrclla has not the time necessary for its develop- ment, so that the larch, though much handicapped, remains healthy. Similarly with the larch in Siberia, it grows there, as in the mountains, very slowly, yet this parasite can no longer reach it.' Sphaerella fragariae Tul. Strawberry leaf - blight. In summer free conidia {Ramularia Tulasnci Sacc.) and pycnidia the iDcrithecia ripen in spring. [This destructive disease of the strawberry has been recorded from all parts of the United States. It first appears on the upper surface as small reddish spots, which rapidly enlarge, the centres withering and browning. The growth of the plants and the crop-yield is seriously impaired.] (Edit.) Sph. gossypina Atks. [Cotton leaf-blight is a disease on leaves of the cotton plant caused by the 6V'/TO.w?Y-stage of this fungus. Small reddish spots appear on the leaf, enlarge, and become dry whitish spots with a red margin. The conidia are elongated and produced in long chains. The asci contain eight elliptical spores, which are slightly constricted at the septum when mature, one cell being usually somewhat smaller than the other. This disease frequently accompanies that one known as 'yellow leaf-blight, ' or mosaic diseas