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Updated: June 18, 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.
Propelled by these, it swims about for a longer or shorter time, but at length comes to a state of rest and gradually grows into a Coleochaete. Moreover, as in the Peronospora, conjugation may take place and result in an oospore; the contents of which divide and are set free as monadiform germs.
If the whole history of the zoospores of Peronospora and of Coleochaete were unknown, they would undoubtedly be classed among "Monads" with the same right as Heteromita; why then may not Heteromita be a plant, even though the cycle of forms through which it passes shows no terms quite so complex as those which occur in Peronospora and Coleochaete?
But the protoplasmic contents of some of the cells of which the plant is made up occasionally divide, by a method similar to that which effects the division of the contents of the Peronospora spore; and the severed portions are then set free as active monad-like zoospores. Each is oval and is provided at one extremity with two long active cilia.
And now, in the afternoon, I felt as if I had been in this long, rambling, tumble-down Villa of Mistra a villa three-quarters of which was given up to the storage of grain and garden tools, or to the exercise of rats, mice, scorpions, and centipedes all my life; as if I had always sat there, in Count Alvise's study, among the pile of undusted books on agriculture, the sheaves of accounts, the samples of grain and silkworm seed, the ink-stains and the cigar-ends; as if I had never heard of anything save the cereal basis of Italian agriculture, the diseases of maize, the peronospora of the vine, the breeds of bullocks, and the iniquities of farm laborers; with the blue cones of the Euganean hills closing in the green shimmer of plain outside the window.
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