PLATE IV. 



KG-. PAGE 



1. Fucus canaliculatus . . 44 



1 a, part of a spore-receptacle. 



1 b, section of spore-receptacle. 



2. Delesseria ruscifolia 138 



2 a, tip of leaf with spore-conceptaelej mag- 



nified. 



3. Sctizymenia edulis 193 



3 a, section of frond, showing spore-clusters, 



magnified. 



