1925] SetcheU-Gardner: MeJanophxjceae 573 



Chordaria flagelliformis f. typica Kjellm. 



Plate 39, fig. 44 



Fronds much branched, primary branch arising near the base, 

 usually longer than the others, main axis nearly percurrent. 



Growing on rocks in the upper sublittoral belt. Bering Sea (St, 

 Lawrence Island) to Sitka, Alaska. 



Kjellman, Om Spets. Thall. II, 1877a;, p. 28 ; Reinke, Atlas, 1889, 

 pi. 39, figs. 1-7; Setchell and Gardner, Alg. N.W. Amer., 1903, p. 250; 

 Collins, Holden and Setchell, Phyc. Bor.-Amer. (Exsicc), no. 1037. 



Chordaria flagelliformis f. ramuscvilifera Kjellm. 



Fronds cylindrical, up to 30 cm. long, slender, with scattered, short, 

 simple branches 1-1.5 cm. long, arising nearly perpendicular to the 

 main axis; cortical filaments 5-6 cells long, distinctly clavate, terminal 

 cell moderately swollen ; zoosporangia elliptical, 55-60/a long, 25-30/x 

 wide. 



Growing in the sublittoral belt. St. Lawrence Island, Alaska. 



Kjellman, Om Spets. Thall. II, 1877a, pp. 29, 30, pi. 1, figs. 10-12 ; 

 Setchell and Gardner, Alg. N.W. Amer., 1903, p. 251. 



Chordaria flagelliformis f. chordaeformis Kjellm. 



Fronds simple or sparsely branched ; cortical filaments nearly 

 cylindrical with terminal cell slightly swollen ; zoosporangia 60-70ju. 

 long, 25-30ja broad. 



Kjellman, Om Spets. Thall. II, 1877a, pp. 28, 29, pi. 1, figs. 13-15 ; 

 Setchell and Gardner, Alg. N.W. Amer., 1903, p. 251. 



This form has been reported by Kjellman in the upper sublittoral 

 belt at Konyam Bay, Siberia, and may be expected to occur in our 

 waters. 



2. Chordaria gracilis S. and G. 



Plate 84 

 Fronds 2.5-3.5 dm. high, with a single main percurrent axis 

 400-500/x diam. arising from a disk ; primary branches numerous, 

 short, scattered along the entire length of the 'main axis and alter- 

 nately arranged on all sides, up to 4 cm. long, standing almost at right 

 angles to the main axis; secondary branches 3-6 mm. long, standing 



