1! ' 23 ] Setchell^Gardner: Melanophyceae 419 



Alg. Vancouver Is., 1913, p. 106, not Ectocarpus gramdatus I', corii- 

 cuLatus Collins, in Collins, Holden and Setchell, Phyc. Bor.-Amer. 

 (Exsicc), no. 1590. 



There are two species of Ectocarpus of fair height with broader 

 but short cells in the filaments occurring on our coast. One of these 

 is E. acid us S. and G. and the other E. corticulatus Saunders. The 

 differences between these tAvo usually strongly corticated species are 

 to be found in the differing terminal cells of the branches and ramuli 

 and in the shapes and dimensions of the gametangia. After carefully 

 considering the different points of view as represented in the syn- 

 onymy, we have felt compelled to recognize the autonomy of this specii-- 

 as well as its close relationship with Ectocarpus arutus. 



6. Ectocarpus fructuosus S. and G. 



Fronds tufted, profusely and alternately branched, up to 2.5 cm. 

 high, attached by a mass of relatively short, creeping filaments; erect 

 filaments several times forked near the base, producing long branches 

 beset throughout with numerous, short, blunt ramuli of 2-3 orders; 

 cells of main erect filaments cylindrical to slightly doliiform, and 

 in part constricted at the cross-walls, 18-25^ diam. below, 2-4 times 

 as long, slightly wider and shorter above; zoosporangia unknown; 

 gametangia numerous, broadly conical, sessile or on 1-3-celled pedicels, 

 50-70/A long, 25-35/x broad at the base. 



Growing on the pneumatocyst of Nereocystis Luetkeana. Moss 

 Beach, San Mateo County, California. 



Setchell and Gardner, Phyc. Cont, VI, 1922, p. 410, pi. 45, figs. 1-4. 



Ectocarpus fructuosus comes within the E. confervoides group, 

 but seems amply distinct from any known forms to constitute a species. 

 This species is based upon the character of the branches, viz., numerous 

 long branches, producing throughout a great abundance of short, 

 rather blunt ramuli and upon these very numerous, rather short and 

 blunt, predominatingly sessile, gametangia. It seems to be a rare 

 species. 



7. Ectocarpus mucronatus Saunders 



Fronds loosely intertwined, 1-6 cm. high, light olive green, attached 

 by a few colorless creeping filaments; erect filaments profusely 

 branched in the upper parts, piliferous; primary branches sub- 

 dichotomous ; ramuli alternate, mostly short and pointed ; cells of 



