HOW TO KNOW THE SEAWEEDS 



188a Tetrasporangia borne in nemathecia; medulla prominent, densely 

 stuffed with ramified filaments. Fig. 238 Zanardinula (in part) 



Fig. 238. Zanardinula lanceolata (Harvey) J. De Toni 



A small portion of an axis, X 0.8. This is per- 

 haps the commonest and most widespread of the 

 several species of this genus along the Pacific Coast. 

 It occurs from southern Cahfornia to northern Wash- 

 ington, and often reaches large, conspicuous size 

 (35 cm.). Other common, non-dichotomous species 

 from central California northward are Z. anderson- 

 iana (J. Agardh) Papenfuss and Z. lyallii (Harvey) 

 J. De Toni, both of which have much broader, more 

 Hgulate blades. 



Figure 238 



188b Tetrasporangia scattered in the 

 cortex (Fig. 237); medulla of loose 

 filaments in a soft jelly. Figs. 235, 

 239 GrafeJoupia iilicina 



Fig. 239. Grateloupia filicina (Wulfen) 

 C. Agardh 



An entire small plant of a rather 

 broad form, X 0.8. This is an exceed- 

 ingly variable species occurring in 

 warm seas in many parts of the world. 

 On our coasts it may be encoimtered 

 from North Carolina southward and 

 along the Gulf coast. 



Figure 239 



179 



