Vol.]] Seichdl-Gardricv. — Alga of North wesiern America. 337 



the inontli of Auj^ust, and bears both eystocarps and tetrasporangia 

 in abundance. It approaches both 0. dentafa and 0. Kamtschat- 

 ica. From the former, it differs in having- the branchlets denti- 

 form to subulate and the cystocarps usually ecalcarate, while 

 from the latter it differs in having the rhachis of the pinnule 

 bearing either cystocarps or stichidia, al:)breviated. Our ])lants 

 differ from the description of J. G. Agardh (1863, p. 898) in 

 being rather thicker in substance and darker in color. It is 

 probable that many changes will l)e made in the names of the 

 species of this genus when an opportunity is given for the study 

 of our northwestern species in their habitats and a comparison 

 with type specimens. Much confusion has already ])een pro- 

 duced, and one has only to compare the accoimts of Ruprecht 

 (1851) and J. G. Agardh (1863) to see how difficult it is likely to 

 be to attempt to unravel completely the synonymy. 



Odonthalia dentate (L.) Lyngbye. 



Point Barrow, Alaska, Farloir (1885, p. 192); St. Lawrence 

 Island, Alaska, Kj('llnnin (1889, p. 24); Victoria, B.C., FarJoir 

 (1886, p. 470). 



We have not seen any specimens referable to this species from 

 our territory. 



Odonthalia dentata f. angusta Harvey. 



Arctic coast of Alaska, Harvey (1872, p. 463.) 



Dasyopsis plumosa (Harvey and Bailey) Schmitz. 



On wood and stones in the upper sublitoral zone. Puget 

 Sound, Harvefi (iiid Ha i lei/ (1851, p. 371), BaiJei/ and Harveij, 

 (1862, p. 160), both under Basya {Stichoairpus) plumosa; west 

 coast of Whidbey Island, Wash., X.L.G., Nos. 17!, 28!, 133!. 

 and in Collins, Holden and Setchell, P. B.-A., No. 942! : Friday 

 Harbor, San Juan Island, Wash., X.LJt., No. 4S6! 



A beautiful species, apparently not very common and occur- 

 ring as far south as Monterey, California. We have examined 

 both cystocarpic and tetrasixtric plants from our territory. 



