146 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 26 



PLATE 20 



Fig. 1 Ceramium caudatum S. & G. Upper part of a tetrasporangial plant 

 from southern California (type of C. avalonae) . 



Fig. 2-3. Ceramium gracillimum var. byssoideum. (Harv.) Feldm.-Maz. Por- 

 tions of filaments of a coarse form and a slender form, X 250. 



Fig. 4. Ceramium calif ornicum. J. Ag. Part of a filament about 1 cm. below 

 the apex, X 100. 



Fig. 5. Ceramium codicola J. Ag. One of the bulb-tipped, pigmented rhizoids, 

 X 120. 



Fig. 6-7. Ceramium fitnbriatum S. &. G. Fig. 6, Upper part of a plant; Fig. 7, 

 Terminal part of an axis, X 125 (after S. & G.). 



