HOW TO KNOW THE SEAWEEDS 

 16b Thallus multiiariously branched 17 



17a Thallus of several long axes bearing numerous short, mostly sim- 

 ple lateral branchlets. Fig. 28 Cumagloia andersonu 



Fig. 28. Cumagloia andeisonii (Fallow) Setchell 

 & Gardner 



An entire plant, X 0.6. On rocks at high in- 

 tertidal levels along the Pacific Coast. 



Figure 28 



17b Thallus irregularly and indeterminate- 

 ly branched in 1-3 orders. Fig. 29. 

 Helminthocladia californica 



Fig. 29. Helminthocladia californica (J. 

 Agardh) Kylin 



The upper part of a plant X 0.6. Occa- 

 sional in upper intertidal pools along south- 

 ern California. 



Figure 29 



18a Thallus solid and smooth, the cortex without a conspicuous super- 

 ficial layer of hairs and paraphyses 20 



36 



