. Fig. 15(3.—Ustilago avenae. The Oat-smut ou Avena sativa. (v. Tubeuf phot.) membrane of the ovary wall. The diseased ears emerge from their enclosing leaf-sheaths, and become exposed to wind and rain, under the effects of which the delicate membrane soon becomes ruptured and the spores are blown or washed away, till only the axes of the spikelet are left with a few ragged remains of the flower. As a rule every shoot of a plant and all the grains of an ear are attacked; if single grains do escape, they remain poorly developed. The spores (5-8;a) have a smooth or slightly granular coat, and

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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi