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Updated: June 29, 2025
The graceful Diatom is a morsel of plasm enclosed in a flinty box, often with a very pretty arrangement of the pores and markings. The Desmid has a coat of cellulose, and a less graceful coat of cellulose encloses the Peridinean. Then the social principle enters. First we have loose associations of one-celled plants in a common bed, then closer clusters or many-celled bodies.
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