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1. The number of these bands varies much in different species of Spirogyra, but is commonly two or three.
2. Each thread is a long tube, branching sometimes, but not divided into cells as in Spirogyra or Cladophora.
3. Lindsay describes experiments carried on in a reservoir infested with Spirogyra.
4. We shall call it the Spiral Conferva, its scientific name being Spirogyra quinina.