HOW TO KNOW THE SEAWEEDS 



38b Thallus not particularly gelatinous or slippery; cortex not as 

 above 39 



39a Medulla of filaments radiating from the large, central axial fila- 

 ment. Figs. 58, 66 Endocladia muTicata 



Fig. 66. Endocladia muricata (Postels 

 & Ruprecht) J. Agardh 



A small portion of a clump to show 

 the spiny character of the branches, 

 X 5. A common, low, densely tufted 

 or matted plant on rocks at rather 

 high intertidal levels along the entire 

 Pacific Coast. 



Figure 66 



39b Medulla more or less parenchymatous. Fig. 67 40 



Fig. 67. Hypnea sp. 



A transection of a thallus to show the 

 parenchymatous type of structure, X 30. 

 Habit drawings of various Hypnea species 

 '^ are shown in figures 68 and 71. 



Figure 67 



40a Thallus bearing occasional conspicuous sickle-shaped (hamate) 

 structures 41 



40b Thallus without sickle-shaped (hamate) parts 42 



60 



