INTRODUCTION 171 TAXONOMy 172 Criteria for Identification 172 ARinities with Free-Living Species . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173 ULTRASTRUCTURE : . . . . . . . . . . 174 Cyanophyta ....... . . ..... 174 Chromophyta ...... . . 175 Chlorophyta ....... . . . \77 LIFE HISTORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178 DISTRIBUTION .. . . 178 EVOLUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178 Preadaptation of Microalgae to Intercellular Symbiosis 179 Growth Outside the Host...... .... .. . . ... .... . . .. . . . . . . .... . ... . . ... . . .. \80
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D. L. Taylor (1973) studied this question.