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Updated: May 22, 2025
In structure, however, the Peronospora is as much a mould as the common Penicillium; and just as the Penicillium multiplies by the breaking up of its hyphoe into separate rounded bodies, the spores; so, in the Peronospora, certain of the hyphoe grow out into the air through the interstices of the superficial cells of the potato plant, and develop spores.
Each of these hyphoe usually gives off several branches. The ends of the branches dilate and become closed sacs, which eventually drop off as spores. The spores falling on some part of the same potato plant, or carried by the wind to another, may at once germinate, throwing out tubular prolongations which become hyphoe, and burrow into the substance of the plant attacked.
The plants afflicted with the malady are found to be infested by a mould, consisting of fine tubular filaments, termed hyphoe, which burrow through the substance of the potato plant, and appropriate to themselves the substance of their host; while, at the same time, directly or indirectly, they set up chemical changes by which even its woody framework becomes blackened, sodden, and withered.
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