NO. 1 TAYLOR: PACIFIC MARINE ALGAE 153 



the writer has collected in the Caribbean area, the Revilla Gigedo mate- 

 rial being in particular quite large. It is perhaps intermediate between the 

 species and what is here distinguished as v. pacificum. 



Mexico: Is. Revilla Gigedo, common in rock crevices in the littoral, 

 Braithwaite Bay, I. Soccoro, nos. 34-2, 34-36, 2 Jan. 1934. Ibid., no. 

 39-49 A, 18 Mar. 1939. Oaxaca, abundant on old shells, Ba. Tangola- 

 Tangola, no. 34-563D, 1 Mar. 1934. Costa Rica: a somewhat narrow 

 form abundant on rocks, much mixed with sand, Golfo Dulce, no. 39-111, 

 26 Mar. 1939. Panama: Bahia de Panama, from rocks along the steep 

 shore, in quiet water near the anchorage, I. Taboga, no. 39-620, 2 May 

 1939. 



V. pacificum n. v.^^ 

 Plate 5, Fig. 7; Plate 33, Fig. 1 



Plant with a slender creeping rhizome, which produces holdfasts at 

 intervals and, on the upper side, thin flat linear lanceolate reddish-purple 

 blades with a short terete stalk, which reach 1-2 cm in length to 1.5-2.0 

 mm in width, the apex blunt, especially in the fertile specimens ; branching 

 chiefly proliferous from the end or margin, when the collective length 

 may reach 3 cm, but sometimes distinctly once pinnate; structure in 

 transverse section showing rhizines in the subcortical blade tissue; tetra- 

 sporangia irregularly disposed in rounded sori near the ends of the blades; 

 cystocarps single in small fertile blades chiefly formed along the distal 

 margins of rather short vegetative blades. 



These Ecuadorean plants are certainly much larger than the Carib- 

 bean ones ordinarily ascribed to G. pusillum (Taylor 1928, p. 142), 

 sexual plants of which apparently have not been reported. It is, perhaps, 

 a parallel species, or at least a variety. Pacific in range. 



Ecuador: Archipielago de Colon, on rocks exposed at low tide, Pta. 

 Albemarle, I. Isabela, no. 34-114 (cystocarpic), 12 Jan. 1934. Ibid., 

 on intertidal rocks at Black Beach Anchorage, I. Santa Maria, no. 34- 

 266 (tetrasporic, TYPE), 18 Jan. 1934. 



88 Gelidium pusillum v, pacificum n. v. — Plantae rhizomatosae, constantes e 

 haptens et laminis tenuibus lanceolatisque, 1-2 cm long, ad 1.5-2.0 mm lat., a 

 margine aut apice proliferentibus; tetrasporangiis in soris rotundatis prope partem 

 extremam laminae; cystocarpis singulis in laminis parvis fertilibus, secundum 

 marginem distalem laminarum brevium vegetativarum magna ex parte orientibus. 

 Planta typica in loco dicto Black Beach Anchorage, I. Santa Maria, Ecuador, 

 legit W. R. Taylor no. 34-266, 18 Jan. 1934. 



