412 University of California Puhlications in Botany ['Voi.. 8 



1836, Phyc. Gen., 1843, p. 287. Sp. Alg., 1849, p. 454, Tab. Phyc, 

 vol. 5, 1855, p. 19, pi. 61, fig. II. Ectocarpus confervoides (3 subidatiis 

 Hauck, Meeresalg., 1884, p. 331 (excl. synonymy). Ectocarpus 

 amphihius Harvey, Phyc. Brit., vol. 2, 1848, pi. 183, Ner. Bor.-Amer., 

 part 3, 1858, p. 125. 



Our plant seems to agree very well with the figures and descrip- 

 tion of Ectocarpus ampkibius Harvey and also, although not so per- 

 fectly, with E. sutidatus Kuetz. They are both brackish water forms, 

 as are our plants. Hauck refers to his var. subulahis also Ectocarpus 

 drapar^naldiaeformis Kuetz. and E. macroceras Kuetz. Judging from 

 Kuetzing's illustrations, these two species may be forms of E. sili- 

 cuJosus but not to be included under f. subtdatus. 



2. Ectocarpus confervoides (Roth) Le Jolis 



Fronds gregarious, forming expansions or tufts, 0.5-10 cm. high, 

 light yellowish to dark brown, sparingly to frequently branched, 

 branching alternate or secund, never opposite, more or less cor- 

 ticated; branches long or short, gradually attenuated, sometimes end- 

 ing in a hair ; prostrate filaments irregular, branched, closely attached 

 to the substratum, but never penetrating it ; chromatophores band- 

 shaped, branched, often provided with pyrenoids; zoosporangia pre- 

 sent in some forms ; gametangia short-obovoid or longer or shorter 

 fusiform, suddenly or somewhat gradually attenuated toward the 

 blunt apex, never ending in a hair, 30-250/x (commonly 60-150ju,) 

 long and 12-35ju, thick, solitary or seriate, terminal or intercalary. 



Growing on rocks, wood, and larger Melanophyceae, widely dis- 

 tributed in its various forms. Alaska (Yakutat Bay) to Washington 

 (Whidbey Island). 



Le Jolis, Liste alg. mar. Cherb., 1863, p. 75 (in part) ; Kjellman, 

 Handb., I, 1890, p. 77 ; Kuckuck, Beitr. Kennt. Ect. Arten, 1891, p. 69 ; 

 Saunders, Alg. Harriman Exp. 1901, p. 418 ; Setchell and Gardner, 

 Alg. N.W. Amer., 1903, p. 237. Ceramium confervoides Roth, Cat. 

 Bot., I, .1797, p. 151, pi. 8, fig. 3. Ectocarpus silicidosus Lyngbye, 

 Hydrophyt. Dan., 1819, p. 131, pi. 43B. 



Kjellman was the first to segregate Ectocarpus siliculosus from 

 E. confervoides and limit it in the sense in which it is understood 

 by Kuckuck and most writers since that time. Even in this narrow 

 sense, Ectocarpus confervoides includes some eight or ten reasonably 

 distinct forms, some of which may ultimately be found to deserve 

 specific rank. It is to be distinguished from Ectocarpus silicidosus 



