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 244 ASCOMYCETES. The disease is best combated by prompt removal of fallen leaves in autumn; where this rule is followed Rlujtisma is seldom found (see p. 71). Rhytisma punctatum (Pers.) (Britain and America). Whereas the spots of the Rhytisma just considered are large, those of this species seldom exceed a few millimetres. They are Fig. 129 —Rhytisma punctatum. Leaf of Acer Pseudoplatanus wit
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 244 ASCOMYCETES. The disease is best combated by prompt removal of fallen leaves in autumn; where this rule is followed Rlujtisma is seldom found (see p. 71). Rhytisma punctatum (Pers.) (Britain and America). Whereas the spots of the Rhytisma just considered are large, those of this species seldom exceed a few millimetres. They are Fig. 129 —Rhytisma punctatum. Leaf of Acer Pseudoplatanus with apothecia; the loaf is yellow, but the spots enclosing the are still green. (V. Tubcuf del.) black in colour, angular, and scattered over the whole leaf- surface. After the leaf has turned yellow, portions of it sur- rounding spots of this Bhytisma retain their green colour, so that we have black spots on green islands in the yellow leaf. The sclerotia dehisce by valves. The apothecia contain thread- like paraphyses and asci. The asci are club-shaped and contain
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