HOW TO KNOW THE SEAWEEDS 



96a Thallus without flattened parts. 



97 



96b Thallus with both flattened and cylindrical parts, 



98 



97a Solid axes bearing hollow, subspherical, grape-like branchlets. 

 Pig. 131 BotTyocladia pseudodichotoma 



Figure 131 



Fig. 131. Botryocladia pseudodichotoma (Fallow) Kylin 



Part of Q fertile, cystocarpic plant, X 1. Although usually of sub- 

 littoral occurrence, this plant may frequently be found in beach drift 

 along the entire Pacific Coast. It is conspicuous because of its pecuHar 

 form and bright red color, and has received the common name of 

 "Sea Grapes." In making pressed specimens the collector will do well 

 to puncture the hollow, turgid vesicles in order to allow them to flatten 

 in the press as their liquid contents are extruded. Otherwise they may 

 burst in the process to give an unnatural appearance to the dry 

 specimen. 



100 



