NO. 1 TAYLOR: PACIFIC MARINE ALGAE 109 



1. Large, with a short trunk bifurcate at the top, and eventually 

 several strap-shaped leaves with serrate or pinnate margins; 

 growth from the transition zone at the end of the stem portion of 

 the plant Eisenia 



MACROGYSTIS C. Agardh, 1820 

 Macrocystis pyrifera (Linnaeus) C. Agardh 



Setchell & Gardner 1925, p. 627, pi. 64, 65; Smith 1944, p. 144, pi. 

 31, figs. 3, 4. 



Mexico: Baja California, abundant at South Bay, L Cerros, no. 34- 

 652, 10 Mar. 1934. Ibid., abundant in deep water off Ba. Thurloe, 

 Pto. San Bartolome, no. 34-618, 9 Mar. 1934. Is. Revilla Gigedo, a 

 few specimens cast ashore and lying at extreme high stonn tide line, Sul- 

 phur Bay, L Clarion, no. 34-56, 5 Jan. 1934. 



EISENIA Areschoug, 1876 

 KEY TO SPECIES 



1. Stalk becoming as much as a meter in length, stout, flattened 

 above ; leaves becoming numerous, several decimeters long, simply 

 serrate, longitudinally rugose, functioning as sporophylls . . 

 E. arborea 



1. Stalk short, much less than 1 dm in length, slender; leaves rather 

 few, approaching a meter in length, serrate to once pinnate . . 

 E. galapagensis 



Eisenia arborea Areschoug 



Setchell & Gardner 1925, p. 646. 



Mexico: Baja California, in early stages of development at South 

 Bay, I. Cerros, no. 34-642, 10 Mar. 1934. Ibid., mature plants numer- 

 ous at Point Hughes, Cabo San Lazaro, no. 34-663, 7 Mar. 1934. 



Eisenia galapagensis n. sp.''"^ 

 Plates 20-22 



Plant with a fibrous holdfast and at first a thin, simple blade ; eventu- 

 ally the simple blade replaced by two diverticula supporting a succession 



■^■^ Eisenia galapagensis n. sp. — Planta magnitudine mediocris, stipite brevi, 

 bifurcate, utroque latere 5-7 (aut pluribus?) sporophyllis membranaceis, e siraplici- 

 bus ad pinnatifida variantibus, marginibus crasse dentatis, ad 15 cm lat. atque 

 aliquot dm long., lobis lateribus vestigialibus aut ad 7 cm aut plus longitudine. 

 Planta typica in loco dicto Academy Bay, I. Santa Cruz, Ecuador, legit W. R. 

 Taylor, no. 34-305, 20 Jan. 1934. 



