204 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



Grateloupia filicina (Wulfen) C. Agardh, /. 



Plants gregarious, to 5-6 cm tall, irregularly and sparingly pinnately 

 branched, below subcylindrical to compressed, 1-2 mm diam., flattened in 

 the middle parts and to 2-3 mm broad, near the tips again subcylindrical 

 and about 1 mm diam.; dull purplish, below firm, above fleshy; struc- 

 turally with a moderately close filamentous central medulla, outside of 

 which there is a much looser arachnoid zone with anastomoses, and this 

 supporting a cortex of anticlinal cell rows. 



These sterile specimens seem rather more firm than one would expect 

 for G. filicina, but the basal portions of that species are often firmer than 

 the upper parts, and this may have been merely a dwarfed type. They are 

 taller and broader than G. Hancockii Dawson (1944, p. 280, pi. 69, fig. 

 2), and would seem to differ in the texture of the tissue around the firm 

 central medulla, but are not dissimilar in habit, though somewhat less 

 branched. 



Mexico: Guerrero, on rocks in shallow water, Ba. Petatlan, nos. 

 34-573, 34-576, 2 Mar. 1934. 



Grateloupia cerroslana n. sp.^^o 



Plate 38, Fig. 2 



Plants to 20 cm tall, fleshy to firm, dull purplish to brownish when 

 dried, below shortly subcylindrical and stalklike, below the first fork 

 flattened and strap-shaped, complanate, dichotomously divided 6-8 times, 

 the tips obtuse, and in the upper part marginally beset with many ligulate 

 or forked proliferations; branches 6-8 mm wide below, about half as 

 wide in the upper divisions, to 1.0-1.5 mm thick; medulla wide, of loose 

 anastomosing slender filaments in a general jelly matrix, the inner cortex 

 of 2-3 series of small rounded cells in branching series, the outer cortex 

 of several layers of progressively smaller cells in sparingly branched radial 

 series, the outermost ones columnar. 



These coarse plants show many thickened, dark purplish-red spots, 

 0.5-1.0 cm diam., which look like sori, but in section show normal vege- 

 tative structure; since they lack reproductive organs, the generic alloca- 

 tion is based on structure only. 



Mexico: Baja California, rare at South Bay on I. Cerros, no. 34-641 

 (TYPE), 10 Mar. 1934. 



120 Grateloupia cerrosiana n. sp. — Plantae ad 20 cm altitudine, succulentae ad 

 subcartilaginosas, infra stipitatae, supra segmentis ligulatis complanatae, 6-8- 

 dichotomae, cacuminibus obtusis; supra a margine proliferae; ramis infra 6-8 mm 

 latitudine, in segmentis cacuminum latitudine dimidia, 1.0-1.5 mm crassitudine. 

 Planta tvpica in loco dicto South Bay, I. Cerros, Mexico, legit W. R. Taylor no. 

 34-641, 10 Mar. 1934. 



