1925] Setchell-Gardner : Melanophyceae 581 



2. Coilodesme bulligera Stroem. 



Plate 45, figs. 77, 78 



Fronds usually fasciculate, 5-12 cm. high, 15-22 mm. wide, 75-85/>i 

 thick, moderately firm, acuminate or rounded above, gradually nar- 

 rowed below into a delicate stipe about a decimeter long, composed 

 of 1-2 layers of large, thin-walled, colorless cells within and a cortical 

 tissue of three layers of cells in vertical filaments or anticlinal rows; 

 color dark brown, plants adhering firmly to paper on drying. 



Growing on rocks in the lower littoral belt, Shumagin Islands, 

 Alaska, to Coos Bay, Oregon. 



Stroemfelt, Meeresalg. IsL, 1886a., p. 173, Om Algenveg. vid Isl. 

 Kuster, 1886, p. 48, pi. 2, figs. 9-12; Saunders, Alg. Harriman Exp., 

 1901. p. 422; Collins, Holden and Setchell, Phyc. Bor.-Amer. (Exsicc), 

 no. 923a; Setchell and Gardner, Alg. N.W. Amer., 1903, p. 240 (in 

 part). 



The saxicolous species of Coilodesme are found in the Arctic Ocean 

 where it joins the North Atlantic (Iceland and Greenland) and in the 

 northern portion of our own territory. Coos Bay, Oregon, is as far 

 south as any has been found. The specimens collected by Gardner 

 at Coos Bay agree well in habit and structure with some collected 

 at Dixon Harbor, Alaska (somewhat northwest from Cape Spencer) 

 by G. B. Rigg. The habit of both sets of plants is close to those col- 

 lected and referred to C. californica by Kjellman at Bering Island 

 (cf. Kjellman, 1889a, figs. 1-3) but his were epiphytic and, conse- 

 quently, to be suspected as being of some different species. The plants 

 already mentioned agree also with the plant distributed by DeAlton 

 Saunders from '* Alaska" under 923rt of the Phycotheca Boreali- 

 Americana (at least in two copies in our possession) and with certain 

 specimens collected by Gardner at Whidbey Island (no. 201). These 

 plants all agree fairly well with the Stroemfelt figure of Coilodesme 

 l)ulligera in being gradually and insensibly attenuated into a distinct 

 slender, comparatively long stipe and in having the cortical layer of 

 anticlinal rows of cells of three to four each and each terminating 

 outwardly in a larger, dark brown, rounded cell. We are, consequently, 

 referring all these to Stroemfelt 's species, but with some uncertainty. 

 It is to be noted that 923^ of the Phyc. Bor.-Amer. is referred by us 

 to our C. pohjgnampta. 



