250 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



immediately above this soon gives rise to numerous decumbent rhizomes 

 which develop clasping hapteres and form a loose, spreading, holdfast 

 tangle about the substratum; branches and branchlets terete, smooth, 

 without cryptostomata ; branching rather dense in the upper parts ; leaves 

 15-25 mm. long, 4-8 mm. wide, apices blunt, base cuneate, margins deeply 

 serrate, cryptostomata absent; vesicles spherical, small, 2-3 mm. diam., 

 smooth, apiculate or crowned by a rudiment of a leaf, supported by pedi- 

 cels mostly shorter than their diameter, occupying positions of leaves 

 toward the base of ramuli, or scattered among the receptacles ; receptacles 

 in short, dense racemes, with short, distinct pedicels below but with ses- 

 sile branches above, mostly blunt. 



Brand. 4, cast ashore, Guaymas?; MacDougal, Puerto Libertad, 

 Dec; D. 383, Tepoca Bay, Feb.; D. 141, dredged at Tiburon Island, 

 Jan. ; D. 157, on rock-shingle beach in lower littoral, south shore Tiburon 

 Island, Jan.; D. 462, San Esteban Island, Feb.; D. & R. 3393, in deep 

 rock pools, Guaymas, Dec. 



Sargassum Liebmanni J. Ag. 



J. Agardh, 1889, p. 91, pi. 5; Setchell, 1937, p. 130, pi. 28, figs. 1-3. 



Setchell, in the above-mentioned paper, has discussed this species so 

 fully that little more need be said here. Reviewing a cotype specimen of 

 Liebmann's collection from St. Augustine, Mexico, together with Mexi- 

 can and Costa Rican specimens identified with it by Setchell, it seems un- 

 likely that any of the plants of the Gulf of California can be included 

 under that name. Setchell has identified H. 2 and H. 5 from San Jose del 

 Cabo as Sargassum Liebmanni, but, since these specimens are only frag- 

 ments and badly encrusted with foreign matter, it seems undesirable to 

 include them as positive records of this species in our area. Rather it is 

 better to suggest that it may be found in the warm waters of the southern 

 coasts of the eastern side of the Gulf and should be looked for there. 



