vol. i] Setchell-Gardner. — AJgce of Northwestern America. 229 



G. coJuerens according to Ruprecht, represents C. arcta of the 

 Atlantic, and is possibly only a form of the latter. I cannot see 

 any differences, and have simply called the specimens G. arcta. 

 The next four species seem to me to be in distinguishable, either by 

 the authentic specimens or by the descriptions. I have used the 

 name C. saxafilis, both as the first name used, and the one 

 having the fullest description. G. ditriuscula is not represented 

 in the herbarium and I do not think that it can be made out from 

 the description. C. cartilaginea is a well marked species, but is 

 not among the specimens you have sent me; it is in my collection 

 from Monterey. The last two species have been confused under 

 the name G. scopceformis, but are certainly distinct forms, and I 

 am inclined to think, distinct species. Both are coarse plants, 

 all the older parts matted in rope-like masses by curving and 

 hooked branches. C. coalita has stouter filaments and shorter 

 cells. The hooked branches are characteristic of these two 

 species, and seldom if ever found in the other species of this list. 

 These two species have very blunt tipped branches, while the 

 Ruprecht specimens of C. •Chamissonis , G. viminea, and G. saxa- 

 tilis, all have the tips acute or acuminate. The mattedness of 

 the lower part of the last three species is not due to hooked 

 branchlets, but to descending rhizoid-like branchlets as in 

 G. arcta. G. polaris Harvey, New Alga? of Japan, Proe. Amer. 

 Acad.. Vol. 4; p. 334, 1859, is the young state of G. scopceformis." 



Family GOMONTIACE^. 



Gomontia polyrhiza (Lagerheim) B. & F. 



In dead shells. Amaknak Island, Bay of Unalaska, Alaska, 

 W.A.H. and A.A.L., No. 3248! ; Popof Island, Alaska, Saunders 

 (1901, p. 415); Harvester Island, Uyak Bay, Kadiak Island, 



Alaska. W.A.S. and A.A.L., No. 5110! 



Family BOTRYDIACE^]. 



Botrydium granulatum (L.) Greville. 



This species has been seen and collected on Camano and 

 Whidbey Islands by one of us (N.L.G.) but no specimens were 

 preserved. There is, however, no doubt as to its occurrence. 



Bot.— 16. 



