210 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.3 



This species is easily distinguished from others of our region by its 

 veiy slender filaments and small size. Collins gives the following charac- 

 ters: plants soft, dense, pale green; filaments 21-30 [x diam. ; segments 4 

 to 5 diameters long, delicate; branching irregular; ramuli long, patent, 

 blunt. 



Growing with Cladophora microcladioides, cast up on beach at Kino, 

 D. & R. 2928a, Nov. 



Cladophora delicatula Montagne 



Montagne, 1850a, p. 302; Kutzing, Tab. Phyc. VI, pi. 1, fig. 2; Collins, 

 1909, p. 337. 

 A single collection of a mass of filaments from the tidal flats of Rio 

 Mayo, D. & R. 3207, December, agrees well both with the description of 

 this species given by Collins and with the figure of Kutzing. The fila- 

 ments are about 50 /* in diameter below, with cells about four diameters 

 long. Above, the filaments are 25-35 ii broad and with shorter cells, 1.5- 

 2.5 times as long, often somewhat constricted. 



Cladophora graminea Collins 



Collins, 1909a, p. 19, pi. 78, fig. 6; Setch. & Gard., 1920, p. 211. 



One specimen of this coarse, erect species, corresponding excellently 

 with Collins' figure and description, was collected in a rock pool on the 

 shore of Tiburon Island, D. 677, July. It is distinguished by its erect 

 habit and coarse texture, main branches about 300 /a in diameter, and 

 very long cells up to 30 diameters long below. 



Other specimens tentatively to be referred here: D. & R. 3147, on 

 tidal rocks, Guaymas, 3229, in tide pools near Guaymas, 3134a, on tidal 

 rocks at entrance to Guaymas harbor, Dec. ; D. 70, in shallow water along 

 shore of Guaymas Bay, Jan.; D. 271, dredged in 12-22 meters, Puerto 

 Refugio, Jan. 



These latter collections are robust, coarse, erect plants perhaps of 

 Cladophora graviinea. The branching, however, is more secund and the 

 cells generally shorter than described for that species. They may prove 

 to be of a distinct entity when more ample collections are at hand and 

 more information is available as to the appearance of C. graminea in na- 

 ture in the Gulf. For the present, it seems best to set them off in this way. 



Cladophora trichotoma (Ag.) Kiitz. 



Kutzing, 1849, p. 414; Howe, 1911, p. 492; Setch. & Gard., 1920, p. 

 210, pi. 16, fig. 2. 



