710 University of California Publications in Botany [Vol. 8 



2. Cystoseira Setchellii Gardner 



Stipe developing from an irregularly conical-shaped solid base, 

 flexible, cartilaginous, irregularly and sparingly forked, 2-3 dm. long, 

 8-10 mm. diam., triangular in cross-section, giving rise to numerous, 

 alternate, flattened branches at short intervals, always from just below 

 the growing point ; flattened branches coriaceous, annual, deciduous, 

 thus producing prominent scars on the stipe, serrated at the base, 

 deeply and pinnately lobed or divided in the middle, 3-4 times pin- 

 nately divided into filiform ramuli at the apex ; the pinnate segments 

 often in turn becoming serrated, lobed, and divided ; color of the 

 living plant dark brown, turning black when dry ; receptacles terminal 

 on the ramuli, 15-25 mm. long ; vesicles 1-3 seriate, terminal one fre- 

 quently mucronate, spherical, containing internal, longitudinal, white 

 fibers, without a margin, 6-8 mm. diam., situated at the base of the 

 serrated segments, or at the base of the filiform branches ; whole plant 

 6-8 dm. long; perennial; dioecious, the two sexes being very similar 

 in external appearance. 



Growing in the sublittoral belt. San Pedro and Redondo, southern 

 California. 



Gardner, New Fucaceae, 1913, p. 329, pis. 47-50. Cystoseira osmun- 

 dacea, Collins, Holden and Setchell, Phyc. Bor.-Amer. (Exsicc), no. 

 CXVb. 



3. Cystoseira neglecta S. and G. 



Stipe arising from an irregular, conical-shaped, somewhat fibrous 

 holdfast, flexible, rather sparingly forked, 5-15 cm. long, 4-6 mm. 

 diam., triangular in cross-section, giving rise to flattened branches 

 alternately arranged just below the terminal growing point ; flattened 

 branches coriaceous, flexible, becoming rigid and brittle when dry. 

 dying back after fruiting, leaving a permanent angular scar on the 

 stipe, when young divided into rounded alternate lobes by a deep 

 sinus rounded at the base ; the lobes of the lower and middle portion' 

 of the branches becoming 2-3 times pinnatified, and the upper lobes 

 becoming repeatedly divided into cylindrical branches terminating in 

 numerous receptacles; air vesicles developing on separate filiform 

 branches, solitary or few in a series but separated 1-3 mm. from 

 each other, spherical, smooth, 2-3 mm. diam., whole plant 4-7 dm. 

 long; color of living plant light brown, turning black when dry; 

 perennial ; dioecious. 



