NO. 1 TAYLOR: PACIFIC MARINE ALGAE 79 



KEY TO SPECIES 



1. Habit involved, the axes somewhat cordlike, being twisted to- 

 gether and united by curved branchlets; branch tips commonly- 

 recurved E. tomentosus 



1. Habit erect, the branch tips not recurved . . E. Duchassaignianus 



Ectocarpus tomentosus (Hudson) Lyngbye 



Setchell and Gardner 1925, p. 426; Taylor 1938, p. 113, pi. 8, figs. 

 6-8; Smith 1944, p. 83. 



Ecuador : Archipielago de Colon, epiphytic on various algae at Black 

 Beach Anchorage, I. Santa Maria, no. 34-398 (gametangial), 30 Jan. 

 1934. 



Ectocarpus Duchassaignianus Grunow 



Taylor 1928, p. 107, pi. 14, fig. 11 ; 1942, p. 48; Setchell & Gardner 

 1930c, p. 140. 



Mexico: Is. Revilla Gigedo, in tide pools near high water mark, 

 Braithwaite Bay, I. Soccoro, no. 34-23, 3 Jan. 1934. Nayarit, on 

 Chnoospora on surfbeaten rocks of I. Maria Magdalena, Las Tres 

 Marias, no. 39-638, 9 May 1939. 



ZOSTEROCARPUS Bornet, 1890 



Zosterocarpus abyssicolus n. sp.^^ 

 Plate 2, Figs. 9-11 



Plant diffuse, about 1-2 cm tall, light greenish brown, without per- 

 sisting main axes, branching irregularly alternate, spreading, primary 

 growth from the branch apices, secondary growth by evident intercalary 

 zones in the younger branches; main axes to 32 /x diam., the cells nearly 

 cylindrical, 58-65 /a long, the walls thin and chromatophores small, disci- 

 form; branches progressively more slender, the ultimate divisions to 16 jm 

 diam., with cask-shaped cells 11-16 /i long; tips of actively growing 

 branchlets moderately tapering and the end cell obtuse, but on matured 

 branches gently tapering with the end cell acute; "sporangia" brown, 

 solitary, intercalary, scattered through the upper part of the plant, oval, 

 29-32 ju, diam., 58-70 /* long, containing oval bodies; gametangia lateral, 

 in small groups of 4-6 cells, about 6-8 /t diam. 



59 Zosterocarpus abyssicolus n. sp. — Planta filamentosa, implexa, alterne ramosa, 

 ad 32 \x diam. in axibus primariis atque ad 16 |x diam. in ramis; "sporangiis" 

 brunneis, intercalaribus, 29-32 \i diam., 58-70 \i long.; gametangiis lateralibus 

 atque botryoideis, 6-8 \i diam. Planta typica in loco dicto Post Office Bay, I. Santa 

 Maria, Ecuador, legit W, R. Taylor no. 34-380, 29 Jan. 1934. 



