NO. 1 TAYLOR: PACIFIC MARINE ALGAE 161 



Pterocladia Okamurai (Setchell & Gardner) n. comb. 



Setchell & Gardner 1937, p. 75, pi. 6, fig. 16, pi. 17, fig. 38. 



These plants show a structure and form very close to P. tenuis Oka- 

 mura (1934, p. 62, pi. 29, pi. 30, fig. 3, pi. 33, figs. 1-3), to which genus 

 the original authors hesitated to assign their plants in the absence of cysto- 

 carps. They are generally somewhat coarser in the branches. The type 

 locality is I. Clarion, Mexico. 



Ecuador: Archipielago de Colon, occasional in the littoral near 

 Black Beach Anchorage, I. Santa Maria, no. 34-216, 17 Jan. 1934. 

 Ibid,, more regularly pinnately branched with longer primary and sec- 

 ondary axes, no. 34-218A, 17 Jan. 1934. Ibid., with branchlets com- 

 monly long attenuate and in part intricately congested, no. 34-268, 17 

 Jan. 1934. Salinas, south side of Pta. Santa Elena, Schmitt no. 5F, 16 

 Sept. 1926. 



Pterocladia Okamurai (Setchell & Gardner), f. densa n. f.®'^ 



Plate 37, Fig. 1 



Younger branches commonly as in the species, but the upper older 

 branches developing much more slender, irregularly placed, densely con- 

 gested branchlets. 



These plants represent a variation which is parallel to P. densa Oka- 

 mura (1934, p. 63, pi. 30, figs. 1, 2, pi. 33, figs. 4-8), considered a sepa- 

 rate species by him rather than a form of P. tenuis Okam. In the present 

 instance the material attributed to the species P. Okamurai shows such 

 variability that specific segregation of these plants would be questionable 

 practice. 



Ecuador : Guayas, on the rocky southeast side of Pta. Santa Elena, 

 Salinas, no. 34-457 (TYPE), 8 Feb. 1934. 



Dumontiaceae 



Plants more or less branched, or plane and entire, commonly soft; 

 the growth from an apical cell but the original axial filament soon ob- 

 scured, the plants then appearing to have a pseudoparenchymatous cortex 

 and a filamentous, often lacunose, medulla; sporangia zonate or tetra- 

 partite ; carpogenic branches of five cells, or sometimes more. 



97 Pterocladia Okamurai, f. densa n. f. — Rami iuniores velut in specie: ramis 

 superioribus, senioribus ramulos raulto tenuiores, irregulariter positos, dense con- 

 gestos formantibus. Planta typica in loco dicto Pta. Santa Elena, Salinas, Guayas, 

 Ecuador, legit W. R. Taylor no. 34-457 (Type), 8 Feb. 1934. 



