NO. 1 TAYLOR: PACIFIC MARINE ALGAE 83 



ROSENVINGEA B0rgesen, 1914 

 Rosenvingea intricata (J. Agardh) B0rgesen, ^ro;c. 



Plants to 3-4 cm tall, crisp, irregularly branched, spreading, en- 

 tangled, the branches tapering to acute tips; medullary cells to 75-115 fi 

 diam., the surface cells 9-13 fx wide, somewhat longer than broad; game- 

 tangia unaccompanied by paraphyses or hairs, 3.8-7.5 fi diam., 28-47 /x 

 long, the segments sometimes undivided, but generally biseriate. 



The description is drawn from no. 34-34. These are, on the whole, 

 firmer plants than those assigned to this species from the Caribbean, less 

 regular in branching, with more adventitious short lateral branches. They 

 do not greatly resemble their Caribbean counterpart. Comparison with a 

 photograph of the type material from Mexico in the herbarium of J. G. 

 Agardh at Lund, no. 47006/7 , showed good agreement, although the 

 plants were rather more slender. B0rgesen's (1930, p. 167) description 

 of Indian material portrays rather shorter (16 \i) gametangia, but he 

 recognizes that they may not have been fully matured. 



Mexico: Is. Revilla Gigedo, rare on rocks in the littoral zone, I. 

 Soccoro, no. 34-34, 3 Jan. 1934. Ibid., on rocks near low tide line, I. 

 Clarion, no. 34-50, 5 Jan. 1934. Ecuador: Guayas, rocky southeast 

 side of Pta. Santa Elena, Salinas, no. 34-463 (?), 8 Feb. 1934. 



GOLPOMENIA Derbes & Solier, 1856 



Plants sessile, commonly ultimately with multiple attachments, spher- 

 ical or irregularly lobed or branched, firmly crisp in texture, hollow; 

 structurally showing one to several inner layers of large colorless cells 

 and one to few outer assimilatory layers with small chromatophores ; 

 colorless hairs present, generally in clusters; plurilocular gametangia in 

 sori, cylindrical. 



KEY TO SPECIES 



1. At least the basal part of the plant subspherical to bullose C. sinuosa 



1. Branching throughout 2 



2. Texture crisply membranous; the surface cells 8.5 ju, diam. or 

 smaller C. ramosa 



2. Extremely delicate ; the surface cells 8.5 /a diam. or larger C. mollis 



Colpomenia sinuosa (Roth) Derbes & Solier 



Taylor 1942, p. 51 ; Smith 1944, p. 128, pi. 20, fig. 1. 

 Mexico: Baja California, at South Bay on I. Cerros, no. 39-649, 10 

 Mar. 1934. Ibid., intertidal at Point Hughes on Cabo San Lazaro, no. 



