1925] Setchell-Gardner: Melanophyceae 589 



A single collection from Orca in the Prince William Sound region 

 of Alaska is all we have of this species and this was earlier (1903, 

 p. 248) referred by us to D. foenkidaceus. The abundance of short 

 branchlets over the plant, however, give it the hispid appearance of 

 Kjellman's species. Certain of the specimens we refer to D. foeni- 

 culaceus approach it, but do not seem by any means, to equal it in 

 hispidity. 



3. Dictyosiphon foeniculaceus (Huds.) Grev. 



Plate 40, figs. 47-49 



Fronds solitary or occasionally several arising from a confluent 

 disk-shaped holdfast, terete, repeatedly much branched, beginning 

 close to the base, 15 cm. to 4 dm. high ; branches either alternate or 

 occasionally opposite, the different orders much reduced in size, the 

 ultimate being very fine, short and subulate, all gradually attenuated ; 

 when young the ultimate branches covered with a dense growth of fine 

 hairs ; superficial cells small, rounded or angular, irregularly disposed 

 or at times in long, longitudinal rows; zoosporangia spherical or 

 ellipsoidal, distributed at random over the surface of the frond. 



Growing on stones and on other plants, in the middle and lower 

 littoral belts. From Bering Sea, Alaska, to Puget Sound, Washington. 



Greville, Alg. Brit., 1830, p. 56, pi. 8, figs. 1-4; Saunders, Alg. 

 Harriman Exp., 1901, p. 422; Setchell and Gardner, Alg. N.W. Amer., 

 1903, p. 248 (in part) ; Harvey, Phyc. Brit., pi. 326. Conferva 

 foeniicidacea Hudson, Fl. Angl., 1762, p. 479. 



This species has more slender as well as coarser forms. It is larger 

 and more robust than Dktyosiphon tenuis and lacks the small slender 

 ultimate branchlets arranged along the branches which give character 

 to D. hispidus. All three of these species differ from D. hippuroides 

 in having more tapering branches which decrease in size with each 

 order of branching. 



4. Dictyosiphon hippuroides (Lyn%b.) Kuetz. 



Frond solid, or occasionally slightly fistulose below, filiform, rigid, 

 moderately branched, 15-60 cm. high, up to 1.25 mm. diam. ; branches 

 of different orders very similar, flagelliform, tapering but slightly ; 

 surface cells in the lower part of the frond arranged in horizontal 

 series, but irregular above ; color dark brown. 



Growing on rocks in the lower littoral belt. Apparently rare in 

 our territory. Reported from St. Paul Island and from near Iliuliuk, 

 Unalaska, Alaska. 



