Nature and development of plants . Fig. 145. Fig. 146. Fig. 145. Appearance of one of the powdery mildews, Uncinula, on leafof elm. Fig. 146. Enlarged view of the mycelium, ascocarp, etc., of one of themildews, Erysiphe: c, erect hyphae forming spores or conidia; h, haustoriapenetrating epidermis of leaf; a, ascocarp or perithecium.

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