246 University of California Publications. [Botany 



Desmarestia aculeata (L.) Lamouroux. 



Floating, or attached to stones in the upper sublitoral zone. 

 St. Lawrence Island, Alaska, Kjellman (1889, p. 50); St. Paul 

 Island, Alaska, Greeley and Snodgrassl, (Setchell 1899, p. 591) ; 

 Kyska Island, Alaska, Townsend, No. 5774! ; near Iliuliuk, Un- 

 alaska. Alaska, W.A.8. and A. A. L., Nos.4036! ,4065! ; Shumagin 

 Islands, Alaska, Saunders (1901, p. 422); Uyak Bay, Kadiak 

 Island, Alaska, W.A.8. and A.A.L., No. 5136a!; Kukak Bay, 

 Yakutat Bay, Sitka, and Wrangell, Alaska, and Victoria, B. C, 

 Saunders (1901, p. 422) ; Esquimalt, B. C, Harvey (1862, p. 164. 

 in 8-10 fathoms of water) ; Puget Sound, Bailey and Harvey 

 (1862, p. 160); Whidbey Island, Wash., N.L.G., No. 118!; 

 North Bay, San Juan Island, Wash., Tilden, No. 352! 



The specimens from the localities mentioned above, are all, 

 or at least as far as the specimens examined are coueerned, of the 

 typical form or very near it. Some of them are rather broad, 

 but, unless we subdivide the species under several forms, they are 

 to be included here and not at all under the following form which 

 is decidedly distinct. 



Desmarestia aculeata f. media (Agardh) J. Agardli. 



Floating, probably coming from the sublitoral zone, where it 

 grows on shells and rocks. Captains Bay, Unalaska, Alaska, 

 II .A.S. anil A.A.L. , No. 4087 ! ; Unalaska, Alaska, AgardhA 1821, 

 pi. 16, under Sporochnus medius) , Postels and Ruprecht (1840, p. 

 13, under 1). intermedin) , BuprecM (1851, p. 375, under Spinularia 

 media); Unga, Alaska, J. B. Downing]; Douglas, Alaska, 

 Eldred Jennel ; Sitka, Alaska, Ida M. Rodgers, No. 5728!; 

 Minnesota Reef, San Juan Island, Wash., Tilden, No. 353!, 

 under I>. viridis. 



The plants considered under this form are so distinct from 

 the ordinary typical D. aculeata, that we are sorely tempted to 

 restore them to specific rank. They lack the flattened character 

 of the fronds of the type, the stem and branches being nearly, 

 if not quite, terete. The opposite branches give this form the 

 appearance of D. viridis, but the substance is much more carti- 

 laginous than in that species and the spines of D. aculeata are 

 present, although not nearly so pronounced as in that species. 



