232 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



San Salvador, no. 34-345, 24 Jan. 1934. Ibid., one piece dredged off a 

 sandy bottom at 37-55 meters' depth off an islet in Gardner Bay, I. 

 Espanola, no. 34-404, 31 Jan. 1934. Guayas, from the northwest beach 

 near Pta. Santa Elena, Salinas, no. 34-451B (cystocarpic), 8 Feb. 1934. 



Gracilaria cerrosiana n. sp.^^^ 

 Plate 77, Fig. 1 



Plants to 25 cm tall, dull purplish red, cartilaginous, bushy, the erect 

 branches subterete below, slightly compressed above, especially at the fork- 

 ings; branching irregularly dichotomous, the segments to 6 cm long below 

 but closer above, 2-3 mm diam. below, but in the ultimate segments 1.5- 

 2.0 mm, the tips slightly tapered, rather obtuse; structurally showing a 

 broad parenchymatous medulla and a narrow cortex of 1-2 layers, of 

 which the outer cells are radially elongate, to 10 /a diam., 20 /x tall. 



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

 636 (TYPE), 10 Mar. 1934. 



Gracilaria pinnata Setchell & Gardner 



Setchell & Gardner 1924, p. 751, pi. 61. 



These specimens were somewhat closer bilaterally branched than fig- 

 ured, and without short spur branches. 



Mexico: Nayarit, dredged from 22 meters' depth at sta. 970 near I. 

 Maria Magdalena, Las Tres Marias, no. 39-650, 9 May 1939. 



Gracilaria Johnstonii Setchell & Gardner 



Plants to 23 cm tall, subcartilaginous, dark rose red, at the base con- 

 tracted and subcylindrical, 1-2 mm diam., above gradually expanded to 

 the flat blades which branch, chiefly dichotomously, 4-5 times, but fre- 

 quently irregularly or polychotomously, the segments in the middle parts 

 of the plant to 1.0-1.5 cm broad above the forks, narrower toward the 

 rounded tips; cystocarpic plants often subsimple, generally less branched 

 than the tetrasporic individuals, the cystocarps prominent, about 0.75- 

 1.25 mm diam. 



138 Gracilaria cerrosiana n. sp. — Plantae ad 25 cm altitudine, fruticosae, ramis 

 infra cylindricis, supra paulum compressis, irregulariter dichotomis; segmentis 

 infra ad 6 cm long., supra arctioribus, diam. infra 2-3 mm, supra 1.5-2.0 mm; 

 cortice ex 1-2 stratis cellularum constante, cellulis externis radiatim elongatis, ad 

 10 \y diam., 20 ]x, altitudine. Planta typica in loco dicto South Bay, I. Cerros, legit 

 W. R. Taylor no. 34-636, 10 Mar. 1934. 



