208 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



July at the peak of the warm-water season. Very thick tufts of half- 

 mature plants were taken from rock pools at Turner's Island, D. 710, 

 and from a rocky point just north of Kino, D. 660. These examples, 

 though young, are typical of the species and show the characteristically 

 long basal cell. 



Chaetomorpha aerea (Dillw.) Kiitz. 



Kutzing, 1849, p. 379; Collins, 1909, pp. 324, 325; Setch. & Gard., 

 1920, p. 200, pi. 14, figs. 9-11. Conferva aerea Harvey, 1846-51, 

 pi. XCIXb. 

 Two collections seem possibly referable to this species reported from 

 the coast of California. D. 285 from Puerto Refugio is young. The plants 

 were scraped from rock surfaces and consist of short tufts of filaments 

 about 350 fi thick. The basal cell is short and those above as long as 

 broad. D. 368 from Tepoca Bay was dredged and consists of only a few 

 stray filaments 200-240 /t in diameter, likewise with cells only slightly 

 longer than broad. The former collection agrees with Collins' description 

 of the typical species, and with the figure of Harvey as far as the cell shape 

 is concerned. The latter collection is probably the detached state of the 

 same species, called by Collins Chaetomorpha aerea forma Linum 

 (Muhl.) Collins. Setchell and Gardner (loc. cit.) have not recognized 

 this form, not having found any Pacific coast specimens agreeing with 

 Collins' description. 



Genus LOLA Hamel 

 Lola lubrica (S. & G.) A. et G. Hamel 



A. & G. Hamel, 1929, p. 1094; G. Hamel, 1930, p. 118, fig. 37, 1-5. 



Rhizoclonium lubricum Setch. & Gard., 1920, p. 185, pi. 9, fig. 



5a-b. 

 The several collections from the Gulf correspond precisely to the de- 

 scriptions both of Setchell and Gardner and of Hamel. The specimens 

 were taken in thick masses, usually floating, resembling, as Hamel says, 

 masses of Spirogyra. The filaments in ours are 25-45, 28-35, 30-50 /a in 

 diameter in various specimens. Hamel reports lateral rhizoids rare or not 

 present. Only unbranched filaments without rhizoids have been observed 

 in the Gulf material. The texture, whether lubricous or not, cannot well 

 be determined from material in the dried state. 



D. & R. 3266, 3263, 3271, floating in tidal stream near Guaymas, 

 Dec. ; D. & R. 3300, in shallow water along shore of bay near Guaymas, 



