Spermatogenesis in Coleochaete scutata

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Abstract
This alga collected in the Chicago region produced antheridia from about June 15 to Oct. 15. By division of an interior vegetative cell of the thallus, which ordinarily would not divide again, 2 antheridial mother cells are formed. Further division of each of the mother cells produces a small antheridium and a sister cell, the latter dividing similarly as did the mother cell. In this way more than 4 antheridia may be developed from 1 vegetative cell. The wall of the sister cell of the last antheridium formed has the appearance of the outer wall of an ordinary vegetative cell. The antheridia contain either normal chloroplasts, abnormal chloroplasts, or none at all. The antherozoids formed from each of the daughter cells usually escape through a common pore. C. scutata is thought to be next to the Charales in complexity of antheridium development.

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