vol.11 Setchell— Gardner. — Algce of Northwestern America. 33/ 



the month of August . and bears both eystocarps and tetrasporangia 

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

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

 form to subulate and the eystocarps usually ecalcarate, while 

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

 bearing either eystocarps or stichidia, abbreviated. Our plants 

 differ from the description of J. G. Agardh (1863, p. S98) in 

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

 probable that many changes will be made in the names of the 

 species of this g'enus 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 been pro- 

 duced, and one has only to compare the accounts 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 dentata (L.) Lyngbye. 



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

 Island. Alaska. Kjellmcm (1889. p. 24); Victoria, B. C, Farlow 

 (1886, p. 470). 



We have not seen any specimens l-eferable 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. Harvey and Bailey (1851, p. 371), Bailey and Harvey, 

 (1862. p. 160), both under Dasya (Stichocarpus) plumosa; west 

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

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

 Harbor. San Juan Island, Wash., X.L.G., Xo. 486! 



A beautiful species, apparently not very common and occur- 

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

 both cystocarpic and tetrasporic plants from our territory. 



