246 Universiiij of California pKhlicafiona. [hotany 



Desmarestia aculeata (Ij.) Lamomoux. 



Floating, or attaclicd to stones in the iii»i)t'r siiblitoral zoiic. 

 St. Lawrence Island, Alaska, Kjelliiion (ISS!), p. .")()); St. Panl 

 Island, Alaska. (Jrcrhi/ dm! Snodgnissl . (Seteliell IS!)!). ]). .l!)]) : 

 Kyska Island, Alaska, TotrtisctuI . No. r)774! : nt^ar Ilinlink. I'n- 

 alaska, Alaska. ir..l .S. <tnd A.A.L., Nos. 4086! , 406.')! ; Slininagin 

 Islands, Alaska, SidouJos (1!)01, j). 42"J); Uyak Bay, Kadiak 

 Island, Alaska, IT. A.N. and A.A.L., No. r)i;}6a! : Knkak Bay, 

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

 Saunders (1!)01, p. 422) ; Esqnimalt, B. C, Harvey (1862, p. 164. 

 in 8-10 fathoms of water) ; Pnget Sonnd, Bailci/ and Harvey 

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

 North Bay, San J nan Island, Wash.. Tilden. No. 352! 



The specimens from the localities mentioned above, are all, 

 or at least as far as the specimens examined are concerned, 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 inchided here and not at all under the following form which 

 is decidedly distinct. 



Desmarestia aculeata f. media (Agardh) J. Ag-ardh. 



Floating, probably coming from the sublitoral zone, where it 

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

 ]\ .A.S. an<IA.A.L.,^o. 4087! ; Unalaska, Alaska, Aqardh.i 1821, 

 pi. 16, under SporocIniHs intdiiis) . rost(ls inul Rnjn-i rlit (1840. p. 

 18, under />. iuiniiK dia) , h'liprecht {\S~)\ , ]). o~'}. luuh'v Sj)i n ii hi ria 

 media): Tuga, Alaska. -/. />. Dmniinyl \ Douglas, Alaska, 

 Eldred Jnuu^l: Sitka, Alaska, Ida M. Rodgns. No. 5728!; 

 Minnesota Reef, San -luan Island. Wash.. Tild<ii. No. 853!, 

 under />. riridis. 



The plants considered under this form are so distinct from 

 the oi'dinai'v typical />. (iciilrafa, that we are sorely tem})ted to 

 restore them to specific rank. They lack the tiattened chai-acter 

 of the fronds of the ty})e, the stem and branches being nearly, 

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

 appearance of />. riridis, but the substance is much more carti- 

 laginous than in that species and the s]unes of />. aculeata are 

 present, although not nearly so ])roiiounced as in that species. 



