CONTENTS xiii 



Type XII 



PAGE 



VAUCHERIA ........ 174 



1. Structure . . . . . .175 



2. Reproduction . . . . . .176 



Type XIII 



PLETJROCOCCTJS VFLGAEIS . . . . . .182 



B. THE PH^EOPHYCM 

 Type XIV 



ECTOCARPTJS SILICULOSITS 



1. Structure ...... 185 



2. Reproduction . , . . . .185 



Type XV 



PELVETIA CANALICULATA . . . . . .189 



1. Structure ...... 190 



2. Reproduction ...... 194 



a. THE FLORIDEJE , .201 



Type XVI 



CALLITHAMNION CORYMBOSUM 



1. Structure . . , , . ,202 



2. Reproduction 



a. Asexual ...... 204 



b. Sexual . . . . . .206 



D. THE CYANOPHYCE^E 



Type XVII 



NOSTOC 212 



