1925] Setchell-Gardner: Mclanophyceae 4:5!) 



Kuetzing, Phye. Gen., 1843, p. 289, Tab. Phyc, 1855, vol. 5, p. 16, 

 pi. 49, fig. 2; Bornet, Note sur quelq. Ect., 1891, vol. 38, p. 358 (repr. 

 p. 6), figs. 6, 7; Collins, Holden and Setchell, Phye. Bor.-Amer. 

 (Exsicc.),no. 732. 



This species has been distributed from southern California under 

 no. 732 of the Phycotheca Boreali-Americana. The specimens dis- 

 tributed were collected at La Jolla by Mrs. Snyder. Gardner has 

 collected it twice at Redondo. Both undoubted zoosporangia and 

 gametangia have been found. All of the specimens from our coast, so 

 far as is known, grow upon Codium fragile, into whose spongy sub- 

 stance they penetrate by long colorless rhizoidal filaments. The 

 specimens agree so well with the figures and descriptions of Kuetzing 

 and Bornet that there seems to be little doubt that our plants are of 

 the same species as those from Europe. 



33. Ectocarpus gonodioides S. and G. 



Fronds minute, forming small tufts 500-550/x high, attached by 

 long, more or less hyaline rhizoidal filaments penetrating the host; 

 filaments sparsely branched at the surface of the host, tapering rather 

 abruptly at the base, long attenuated upward to a blunt apex, 18-24/t 

 diam. at the base, 10-14/x at the apex ; cells 1-2 times as long as broad ; 

 zoosporangia unknown; gametangia narrowly fusiform on 1-2-celled 

 pedicels, near the base of the erect filaments, up to 125/* long, 20-28/* 

 diam. in the widest part. 



Growing on Codium cuniatum. Smith Island, Gulf of California. 



Setchell and Gardner, The Mar. Alg. Gulf of Calif., 1924. pp. 721, 

 722, pi. 17, fig. 44. 



The small tufts which this species of Ectocarpus produces remind 

 one of the genus Gonodia (Myrimtis), but the penetrating part, which 

 extends relatively deep into the host, is composed of slender, almost 

 colorless, slightly branched, closely intertwined filaments, which, how- 

 ever, do not coalesce or form a false parenchyma as in the case of some 

 species of Gonodia, The plants, though sparse, are in excellent fruit- 

 ing condition. The chromatophores are too much disorganized for 

 characterization. 



