122 



ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



f. megaphyllum n. f."^^ 

 Plate 30 



Plants to over 45 cm tall, virgate to paniculate, stems smooth, leaves 

 thin, light brown, not crowded, 2-5 cm long, 6-15 mm wide, obtuse lance- 

 olate to oblong lanceolate with broadly rounded ends, undulate, the 

 margins slightly to strongly irregularly and acutely serrate, occasionally 

 slightly ciliate at the base, the midrib evident to near the tip, the cryp- 

 tostomata very small, few and scattered or apparently absent; vesicles 

 moderately numerous, spherical, to 8 mm diam., on stalks about as long, 

 the stalks cylindrical or a little flattened, occasionally foliaceous, even 

 serrate, and rarely 1-2 teeth on the margin of the vesicle; receptacles as 



in the type. 



The dredged specimen (no. 34-337) is an extreme phase, but being 

 sterile is not designated the type of the form. These plants appear to be 

 an extension of the variation of the species opposite to that which pro- 

 duces the f. rigidiusculum, and in the more small-leaved specimens ap- 

 proaches the so-called f. subdeltcatulum. 



Ecuador: Archipielago de Colon, in the shore drift at Pta. Albe- 

 marle, I. Isabela, no. 34-106 (TYPE), 13 Jan. 1934. Ibid., in the drift 

 at Tagus Cove, no. 34-U9B, 13 Jan. 1934. Ibid., dredged at 9 meters' 

 depth, I. Baltra, no. 34-337, 22 Jan. 1934. Ibid., drifting oflF Black 

 Beach Anchorage, I. Santa Maria, no. 34-255, 17 Jan. 1934. 



Sargassum ecuadoreanum n. sp.^® 

 PlateSl, Figs. 1,2 



Plants to 75 cm tall or more, several smooth subsimple branches 

 arising from a short rough main stem, bearing scattered leaves at intervals 

 of 1-2 cm; leaves thin, light brown, 4.5-7.5 cm long, 6-10 mm wide, the 

 base long and slightly asymmetrically tapered to a short petiole, above 

 lanceolate to a little oBlanceolate, the tip generally obtuse to moderately 



"^^ Sargassum pacificum f. mei^aphyllum n. f. — Forma maior quam planta 

 typica, foHis tenuibus 2-5 cm longitudine, 6-15 mm latitudine, obtuso-lanceolatis 

 ad oblongo-lanceolata, undulatis, valde irregulariter aciiteque serratis, infra inter- 

 diim ciliatis. Planta tvpica in loco dicto Pta. Albemarle, I. Isabela, Ecuador, legit 

 W. R. Taylor no. 34-106, 12 Jan. 1934. 



80 Sargassum ecuadoreanum n. sp. — Planta altitudine maior 7.5 dm, stipite 

 inferiore aspera brevique, ramos primarios multos levesque ferente ; foliis paulu- 

 lum sparsis, tenuibus, 4.5-7.5 cm long., 6-10 mm lat., lanceolatis ad oblanceolata; 

 folio basim attenuatam, apicem acutum ad obtusum, marginem crassissime ser- 

 ratum, costamque paene percurrentem habente; cryptostomatibus minimis dispersis- 

 que;vesiculis sphaeroideis, ad circa 7 ram diam.,stipitum longitudine circa dimidia. 

 Planta tvpica in loco dicto Pta. Santa Elena, Ecuador, legit W. R. Taylor no. 

 34-473, i Feb. 1934. 



