PLATE IV. 



FIG. 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-conceptacle ; mag- 



nified. 



3. Schizymenia edulis 193 



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



magnified. 



