HOW TO KNOW THE SEAWEEDS 



86b Plants epiphytic; sacs sometimes so flattened as to appear blade- 

 like. Fig. 122 Coilodesme 



Figure 122 



Fig. 122. Coilodesme rigida Setchell & Gardner 



Several plants growing on a piece of Halidrys, X 0.8 Five species 

 occur more or less locally along the Pacific Coast. This one is occa- 

 sional in southern California while the commonest and most wide- 

 spread one, C. califoTnica (Ruprecht) Kjellman occurs on Cystoseiia 

 from central CaHfornia northward. 



87a Thallus hollow-tubular, at least in older parts, and of uniform 

 structure throughout. Fig. 124 88 



87b Thallus not of uniform structure throughout, with differentiation 

 of parts 96 



93 



