1925] Setchell Gardner: Melanopkyceae 583 



from Bering Sea arc more ample, broader, tapering more abruptly 

 into the slender stipe (at least in older specimens) than is represented 

 in the figure of Stroemfelt (1886, pi. 2, fig. 9) or as compared with a 

 specimen from Greenland distributed by Rosenvinge. In Stroem- 

 felt's figure and in Rosenvinge's specimen, the cortex is made up of 

 closely packed anticlinal rows of 3-4 cells each and each row ends 

 outwardly in a somewhat Larger, dark brown, rounded cell. In the 

 Bering Sea plant, the anticlinal rows are not recognizable, or are at 

 most of only two cells, the outer deep colored cell usually sitting imme- 

 diately upon the larger transparent outer cells of the inner layer. The 

 typical form of our plant which we consider a distinct species is repre- 

 sented by no. 923/; of the Phycotheca Boreali-Americana, and the type 

 locality is Amaknak Island in the Bay of 1'nalaska. 



5. Coilodesme Cystoseirae (Rupr.) S. and G. 



Fronds flaccid, irregularly cylindrical, blunt at the apices, taper- 

 ing abruptly into a short stipe about 2 mm. long, 1-4 dm. (up to 8 dm.) 

 high, 3-8 mm. diam., broad, usually inflated, composed of 2 layers of 

 large, thin-walled, colorless cells on the interior and 2 layers of small, 

 cuboidal, cortical cells ; zoosporangia ovoid, 15-20/x. long, ll-14,u wide. 



Epiphytic on Cystophyllwm <j< minatum. Kukak Bay and Yakutat 

 Bay, Alaska. 



Setchell and Gardner, Alg. N.W. Amer., 1903, p. 241; Collins, 

 Holden and Setchell, Phyc. Bor.-Amer. (Exsicc), no. 1128. Coilo- 

 desme linearis Saunders, Alg. Harriman Exp., 1901, p. 421, pi. 48; 

 Collins, Holden and Setchell, Phyc. Bor.-Amer. (Exsicc), no. 824. 

 Asperoeoccus Cystoseirae Ruprecht, Tange Och., 1851, p. 370 ; not 

 Encoelium Cystoseirae Kuetzing, Tab. Phyc, vol. 9, 1859, pi. 6, fig. 

 IV, e-h. 



This species of Coilodesme may readily be distinguished from all 

 other known species of the genus by its relatively narrow and long 

 cylindrical fronds, gradually attenuated at the base to a short stipe. 

 According to Saunders, it replaces the broader plant which he referred 

 to C. ealiforniea. (probably our C. sitehensi-s) on the coast of Alaska 

 to the westward of Yakutat Bay. The dimensions given by Ruprecht 

 for his plants are far under those of the plants referred by us to his 

 species, but his plants were probably very young, similar to the very 

 young and slender individuals included by Saunders {Joe. eit.) in the 

 group figured by him. Ruprecht 's plants, also, showed no reproductive 

 bodies. 



