THE phenomenon to which Mr. Bennett alludes is, I presume, well known ; but it is not universal, though common. He will find illustrations in Hassal's “British Freshwater Algæ,” where the zygospores are formed in both filaments simultaneously; e.g., plate 19, Zygnema (Spirogyra) ; plate 38, several species of Tyndaridea. But in those genera in which the… (More)
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