NO. 1 TAYLOR: PACIFIC MARINE ALGAE 157 



Gelidium cartilagineum (Linnaeus) Gaillon, v. robustum Gardner 



Gardner 1927, p. 280, pi. 54; Smith 1944, p. 197, pi. 43, fig. 4. 



Mexico: Baja California, on rocks near South Bay, I. Cerros, no. 

 34-639, 10 Mar. 1939. Ibid., rare on rocks at Ba. Thurloe, Pto. San 

 Bartolome, no. 34-617, 9 Mar. 1939. 



Gelidium Hancockii n. sp.^^ 

 Plate 34, Figs. 1, 2 



Plants to 25 cm tall from a small fibrous, somewhat flagelliferous 

 base, the erect axes sparingly to freely 1-2 times alternately divided, es- 

 pecially below, virgate, compressed, to 2-3 mm broad, below becoming 

 naked but roughened by scars of fallen lateral branches; determinate 

 branchlets closely alternately to suboppositely placed along the margins 

 of the chief axes, once, seldom twice pinnate, generally only about 1.5 cm 

 long, the ultimate branchlets ligulate, minutely but sharply aculeate- 

 serrate, 1-3 mm long; in section clearly showing rhizines in the subcortex; 

 tetrasporangial sori occupying the central area of the fertile ultimate 

 branchlets, leaving a narrow sterile serrate margin. 



These plants are rather more coarse than some from Copacabana 

 determined with some reservations by Setchell and Gardner as G. semi- 

 nudum J. Agardh, which otherwise seemed superficially identical. How- 

 ever, on examination of the branchlets with a lens the serrate character 

 was very striking, and a certain distinguishing feature. Howe's G. crispum 

 (1914, p. 94, pi. 33, pi. 34, figs. 1-6) is a smaller, bushy plant more 

 repeatedly pinnate and with relatively flatter axes. From the other West 

 coast species, G. filicinum Bory, also found in the Galapagos, these speci- 

 mens are distinguished by the absence of a bushy pyramidal habit of 

 branching, and much greater coarseness, as well as details of branch form. 

 Material from Payta, Peru (Hassler Exped. nos. 79, 112), both tetra- 

 sporic and cystocarpic, was available for comparison. Specimen no. 34-215 

 is much more slender and more amply branched in the first and second 

 degrees than the other, but on the branches of the last degree the branch- 

 lets are similar to those on the coarser specimen. Farlow (1902, p. 95) 

 reported plants from I. Wenman under the name of G. serrulatum which 



93 Gelidium Hancockii n. sp. — Plantae ad 25 cm altitudine, basi fibrata, axibus 

 erectis 1-2-alterne ramosis, virgatis, compressis, ad 2-3 mm lat., infra nudescenti- 

 bus; ramis determinatis conferte alternis ad suboppositos secundum margines 

 axium primariorum, 1-2-pinnatis, circa 1.5 cm long., ligulatis, minute acuteque 

 aculeato-serratis; soris tetrasporangialibus superficiem centralem ramulorum fer- 

 tilium, intra marginem serratum sterilemque occupantibus. Planta typica in loco 

 dicto Black Beach Anchorage, I. Santa Maria, Ecuador, legit W. R. Taylor no. 

 34-218B, 17 Jan. 1934. 



