vol.i] SetcJiell— Gardner. — Algee of Northwestern America. 345 



Platythamnion heteromorphum f. reversum Setchell and 



Gardner f. nov. Plate 25. 



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

 Nos. 8!. 621! 



This form differs from the last in the branehlets of the upper 

 pinnules being secund and on the lower side, as shown in the 

 figure quoted above. It may be only a casual variation, but it 

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

 waters. 

 Ceramium rubrum (Hudson) Agardh. 



Bering Sea, Herb. University of California (2 specimens 

 without name of collector, but date of 1S92) ; St. Lawrence 

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

 Prince William Sound and Sitka, Alaska, Saunders (1901, p. 

 439): Esquimalt. B. C, Harvey (1862, p. 175); Vancouver 

 Island. B. C. J. G. Agardh (1894, p. 38); Puget Sound, Bailey 

 and Harvey (1862. p. 163). 



We quote under this name the specimens referred here by 

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

 certain that a careful study will show that more than one species, 

 in the later sense of J. G. Agardh (1894, under Ceramium), has 

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

 Sea specimens are C. rubrum in the naiTOwer sense. 



Ceramium rubrum var. Pacificum Collins. 



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

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

 sap County. Wash., Tilden, No. 207!, under Ceramium 

 diaphanum. 



The plant referred here is common on the western coasts of 

 North America from Puget Sound to Lower California, biit the 

 name is merely provisional since it may be referred later under 

 some other of the C. rubrum- group. The specimen of Miss 

 Tilden's American Algae is a fragment, but seems to belong here, 

 certainly not under Ceramium diaphanum (Lightfoot) Agardh. 



Ceramium cancellatum Agardh. 



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

 Unknown to us. 



