416 University of California Publications in Botany [Vol. 8 



secund, acute-subulate; cells slightly doliiform, 40-60;a diam., 0.4-2 

 times as long as broad (usually shorter than the breadth) ; chromato- 

 phores thick, irregularly branched bands, few in a cell, containing 

 several pyrenoids ; zoosporangia unknown ; gametangia numerous and 

 regularly placed, cylindrico-conical, 100-1 50/a (up to 230;U.) long, 

 20-35/x broad. 



Growing, for the most part at least, on larger Melanophyceae. 

 Puget Sound to central California (Carmel). 



Setchell and Gardner, Phyc. Cont. VI, 1922, p. 404, pi. 48, figs. 

 36-39 and pi. 49, figs. 40, 41. Ectocarpus penicillatus Saunders, Phyc. 

 Mem., 1898, p. 155, pi. 21, figs. 3, 4 (not of Kjellman). Ectocarpus 

 confervoides f. acuminatus Collins, in Setchell and Gardner, Alg. 

 N.W. Amer., 1903, p. 237, Mar. Alg. Vancouver Is., 1913, p. 106; 

 Collins, Holden and Setchell, Phyc. Bor.-Amer. (Exsicc), nos. 1033, 

 1127. 



The type of this species is no. 2886 of Gardner, collected at Carmel, 

 California, in May, 1915, and growing on Desmarestia herbacea. It 

 seems to be the same as the plant figured (and described) by Saunders 

 (loc. cit.) under Ectocarpus penicillatus. It is undoubtedly the same 

 plant as that described by F. S. Collins under the name E. confer- 

 voides f. acuminatus which was founded on no. 235 of Gardner (Herb. 

 Univ. Calif., no. 99022) collected at Whidbey Island, Washington, 

 growing on a broad form of Desmarestia. Its affinities are closely with 

 Ectocarpus confervoides f. typicus, but it ha-s shorter cells, sharper 

 ramuli, decidedly constricted filaments, with the gametangia more 

 inclined toward cylindrical than is general in that form. The chro- 

 matophores are more distinctly band-shaped and more separated from 

 one another than in E. confervoides. 



A few small but profusely fruiting specimens of plants seemingty 

 of this species have been found growing on Myriogloia Andersonii at 

 Neah Bay, Washington (Gardner, no. 3817). These were attached 

 to the host b}' means of penetrating rhizoidal filaments, particularly 

 by the descending corticating filaments. The specimens differ from 

 the typical form in being smaller, in having shorter and blunter game- 

 tangia and in having on separate individuals seriate 700sporangia( ?) 

 some of which are divided longitudinally into four loculi. Further 

 study of more material will be necessary to determine the status of 

 this form. For the present we are placing it with E. acutus. The 

 zoosporangia are very numerous, and they resemble in form those 

 figured by Sauvageau (1896&, p. 33) for Ectocarpus virescens. They, 



