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The fertilizing cell, its varying form and behavior by Nelly Peery, 1890

The fertilizing cell, its varying form and behavior by Nelly Peery, 1890, Page 36

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34. but becomes covered with numerous short, active cilia - thus forming a zoospore, and often moving about in the water for a time (some-times only a minute or two), it comes to rest, the cilia disappear, a wall of cellulose is formed, and it acts as did the spores already described. The sexual phase in this plant consists of two essentially different parts, as in Peronospora:
 
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