Vol.1] SetcJiell-Gardner. — AlgcB of Northwesiern America. 345 



Platythamnion heteromorphum f. reversum Setchell and 



Gardner f. no v. Plate 2."). 



Cast ashore. West coast of Whidbey Island, Wash. , X. L. (i., 

 Nos. S!, 621! 



This form differs from the last in the l)ranchlets of the n])per 

 pinnnles being secnnd and on the lower side, as shown in the 

 figure qnoted above. It may l>e only a casnal variation, bnt it 

 deserves at least a form-name and more stndy in its native 

 waters. 



Ceramium rubrum (Hndson) Agardh. 



Bering Sea, Herb. Unirersiiij of CdJifonihi (2 specimens 

 withont name of collector, bnt date of 18i)2); 8t. Lawrence 

 Island and Port Clarence, Alaska, KjeUnutn (1889, p. 32); 

 Prince William Sonnd and Sitka, Alaska, SaNiulprs (1901, p. 

 439); Esqnimalt, B. C, Hunu'ij (1862, p. 175); Vanconver 

 Island, B. C, J. O. Aganlli (1894, ]). 38); Pnget Sonnd, Bdih^i/ 

 (111(1 Rdn'f!/ (1862, p. 163). 



We (|uote nnder this name the specimens referred here by 

 others and which we have not been able to examine. We feel 

 certain that a carefnl stndj" will show that more than one species, 

 in the later sense of J. G. Agardh (1894, nnder Ceraminm), has 

 been inclnded. We do not feel at all certain that the Bering- 

 Sea specimens are G. ruhriini in the narrower sense. 



Ceramium rubrum var. Pacificum Collins. 



Port Renfrew, B. C, Butler and Pollen, No. 30; west coast 

 of Whidbey Island, Wash., N.L.G., No. 117!; Tracyton, Kit- 

 sap Connty, Wash., Tildeit, No. 207!, nnder Ceraiiihiin 

 diaphauiini. 



The. plant referred here is common on the western coasts of 

 North America from Pnget Sonnd to Lower California, bnt the 

 name is merely provisional since it may lie referi-ed later nnder 

 some other of the G. ruhrx t)i -gvoni). The specimen of Miss 

 Tilden's American Algte is a fragment, bnt seems to belong here, 

 certainly not nnder Geramiurn (Uaplianum (Lightfoot) Agardli. 



Ceramium cancellatum xVgardh. 



Esqnimalt, B. C, Harvey (1862, p. 175). 

 Unknown to ns. 



