426 Unwersity of California Publicaiions in Botany \yo-L. 8 



cavities of the injured cells. Its prostrate filaments and the lower 

 portions of the erect filaments have moniliform, almost globular, cells 

 which, together with rhizoidal filaments issuing from the very basal 

 ones, while perfectly separate, form a thin layer or cushion, with 

 something of the appearance of that of Elachistea. 



Our specimens seem to agree so closely with the figures and descrip- 

 tion of Sauvageau and to grow under such almost identical conditions, 

 that we must necessarily refer them to this species. Thus far it has 

 been detected only at Lands End, San Francisco, California, and 

 only on one occasion. Our specimens show zoosporangia (not hitherto 

 described) as well as gametangia. 



16. Ectocarpus granulosus (Eng. Bot.) Ag, 



Fronds tufted, rather coarse and rigid, 1-8 cm. (up to 16 cm.) 

 high, profusely branched ; primary branches opposite or whorled, 

 mostly corticated below; secondary branches opposite or at times 

 alternate, short, tapering upward, often recurved at the tip, ending 

 in hairs; ultimate ramuli secund, short, acute, ending in short hairs; 

 cells of the main filaments SO-lOO^u, diam., quadrate or shorter than 

 the diameter, constricted at the cross-walls; chromatophores small, 

 regular disks; zoosporangia "sessile, globose"; gametangia sessile, 

 broadly ovoid, asymmetrical, mostly secund on the terminal and 

 subterminal ramuli, 60-lOOfi long, 30-60/x broad. 



Growing on various other algae and on stones in the lower littoral 

 belt. Washington (Puget Sound) to southern California (San Pedro). 



Agardh, Sp. Alg., vol. 2, 1828, p. 45 ; Saunders, Phyc. Mem. 1898, 

 p. 156, pi. 24, figs. 3-5 ; Setchell and Gardner, Alg. N.W. Amer., 1903, 

 p. 238; Collins, Holden and Setchell, Phyc. Bor.-Amer. (Exsicc), 

 no. 1589. Ectocarpus gramiClosus f. corticidatus Collins, in Collins, 

 Holden and Setchell, Phyc. Bor.-Amer. (Exsicc), no. 1590. Conferva 

 granulosa English Botany, 1814, pi. 2351. 



Ectocarpus granulosus was discovered by W. Borrer in the vicinity 

 of Brighthelmston (Brighton), East Sussex, England, and is now 

 reported from many coasts of Europe and both eastern and western 

 North America. There is considerable variation, especially as regards 

 dimensions both of the primary branches and of the gametangia. In 

 some of our specimens, the gametangia reach a length of 165/^, and 

 a breadth of 65;^, but the majority are 90-110/a long and 50-60;u, broad. 

 We have not seen zoosporangia in any of our specimens. The very 



