212 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



Plants 3-4 mm. high, forming small, dense tufts on rock surfaces, 

 cnistaceous corallines, etc., attached by a spreading mat of multicellular, 

 branched, creeping filaments, bright green ; individual fronds erect, with 

 a stupose axis, about 60 /i, diam. below, ultimate branches about 25 fi 

 diam. ; branches strict, subdichotomous to secund, gradually decreasing in 

 diameter to the extremities, but these + — blunt ; cells mostly 4-5 diam- 

 eters long, occasionally much longer below; mature and empty zoospo- 

 rangia present, the cells short and swollen, about 40 to 70 p. in dimen- 

 sions, conspicuous beside the slender cells of the sterile branches. 



Type: Dawson 132, scraped from rock pools at low tide. Turner's 

 Island near Tiburon Island, Jan. 24, 1940. Herb. AHF no. 5. 



The erect, stiff habit of this minute plant, resembling Cladophora 

 graminea in all but size, sets it apart from any known Pacific coast spe- 

 cies. The presence of zoosporangia and its encrustation with diatoms and 

 other minute epiphytes indicate its maturity. 



Family Bryopsidaceae 



Genus BRYOPSIS Lamouroux 

 Bryopsis plumosa var. pennata (Lam.) B0rg. 



B0rgesen, 1913, p. 117. Bryopsis pennata, Vickers, 1908, p. 30, pi. 

 LII. 



The specimens at hand agree closely with Vickers' figures. Only a 

 single collection is available, but specimens were obtained in luxuriant 

 abundance. The plants are 3-4 cm. high, forming very thick, rounded 

 tufts on rock surfaces. This species was not present at the time of the 

 winter expedition and is apparently a warm-water annual. 



D. 688, lower littoral reef-rocks, Turner's Island, July. 



Family Gaulerpaceae 



Genus GAULERPA Lamouroux 



Gaulerpa van Bosseae S. & G. 



Setch. & Gard., 1924, p. 704, pi. 13, figs. 13-15. 



Bryant 1 (AHF no. 72), islands of San Jose and Espiritu Santo; D. 

 214, lower littoral rocky shore, Puerto Refugio, Jan. 



The latter specimens are large and vigorous, measuring several centi- 

 meters in extent, of somewhat larger diameter than the type throughout 

 (500-800 ju,). They grow in loose, spreading tangles over broken shell in 

 rock pools. 



