116 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.12 



Setchell 1937b, p. 143, pi. 28, figs. 11, 12, pi. 32, figs. 58, 59. 



The denser specimens of this plant are with difficulty separated from 

 S. galapagense. and the writer is not altogether convinced that Setchell 

 was correct in giving this name full species rank. However, in most cases 

 a fairly clear disposal could be made, with the relative congestion of the 

 receptacles the most reliable, though variable, character. Both dense and 

 loose-branched plants were collected attached near low tide level, but 

 both S. galapagense and loose forms of S. setifolium were drifted ashore 

 and may have come from deeper water. These specimens covered even a 

 wider range of variation than those in the Howell collections kindly 

 loaned by the California Academy of Sciences. 



Ecuador: Archipielago de Colon, I. Isabela, Hassler Exped. nos, 

 1007, 1017, June 1872. Ibid., dredged from 5.4-7.2 meters off Black 

 Bight, Schmitt no. 63B-33, 8 Feb. 1933. Ibid., drifted ashore at Tagus 

 Cove, no. 34-149 D, 13 Jan. 1934. Ibid., on rocks near low tide level, 

 no. 34-144, 13 Jan. 1934. Ibid., reef north of the cove, nos. 34-172, 

 34-173A, 13 Jan. 1934. Ibid., drifting ashore on I. Bartolome, I. San 

 Salvador, no. 34-350 A, 23 Jan. 1934. Ibid., I. San Cristobal, Albatross 

 Exped. no. 10, Apr. 1888. 



Sargassum galapagense Grunow 

 Plate 25 



Plants to over 7 dm tall, narrowly pyramidal, the stem smooth, leafy 

 above, defoliate below and with branches 10-15 cm long; leaves 2.5-5.0 

 cm long, simple or once or twice forked, narrowly linear to rarely 4 mm 

 wide, entire to vaguely erose or infrequently on the widest leaves near 

 the tip sparingly serrate, the apices and bases acutely tapered, the midrib 

 in narrower leaves not distinguishable, and even in the broader leaves 

 inconspicuous, disappearing in the upper part of the leaf; cryptostomata 

 apparently absent; vesicles numerous, oval, smooth to muticous or the 

 tip occasionally somewhat foliose, stipitate, the stalk 1-2 times as long as 

 the vesicle; receptacles congested in clusters less than 1 cm long, alter- 

 nately to subdichotomously branched, the ultimate segments relatively 

 long and tapered. 



Grunow in Piccone 1886, p. 48, pi. 1, figs. 2, 3; Grunow 1916, p. 

 167; Setchell 1937b, p. 141, pi. 29, figs. 20-27, pi. 30, figs. 28-30, pi. 32, 

 figs. 54-57. 



The bulk of the material in the Howell collections was small, and of 

 basal shoots with relatively broad, simple leaves, and it hardly exemplifies 

 the full development of this species. Farlow's (1902, p. 92) records of 



