NO. 1 TAYLOR: PACIFIC MARINE ALGAE 101 



Mexico: Nayarit, on Isla Maria Madre, legit A. L. Herrera no. 

 246, Man-May 1927 (Herb. N.Y. Bot. Gard.). Costa Rica: infre- 

 quent on rocks near the entrance to the bay, Golfo Dulce, no. 39-100 

 (TYPE), 26 Mar. 1939. Panama: Bahia Honda, scarce and stunted 

 in the lower tide pools, no. 39-1 34 A, 26 Mar. 1939. 



Padina Durvillaei Bory 



Bor>^ de St. Vincent 1829, p. 147, Atlas 1826, pi. 21, fig. 1 ; Farlow 

 1902, p. 91 ; Howe 1911, p. 497; Dawson 1944, p. 230. 



Padinas are nearly as common in the littoral flora on the tropical 

 Pacific American coast as they are in the Caribbean. On the higher rocks 

 they form close dense growths a couple of centimeters high, especially 

 along cracks. In tide pools they reach a better size, and in deep water may 

 become relatively huge. Here we may get dredged specimens 4 dm tall, 

 and they may be divided by wave action into many narrow segments or, 

 if the water is quiet as at deeper stations, we may get individuals with 

 blades to 2 dm broad. Again, in considering texture, we find great vari- 

 ation. Some specimens of P. Durvillaei are firm, indeed almost leathery, 

 while at the other extreme some are quite as delicate as West Indian P. 

 Vickcrsiae of the same size. There seems no division of these thin and 

 thick forms into separate species, or even sharply marked varieties. The 

 histological features of thickness, size and shape of cells in the different 

 layers and in the spore band characters appear to fall into unbroken ranges. 



Mexico: Baja California, south shore of I. Cerros, Schmitt no 

 number, 29 Aug. 1932. Ibid., at Pt. Hughes on Cabo San Lazaro, no. 

 34-662, 7 Mar. 1934. Is. Revilla Gigedo, in tide pools at Braithwaite 

 Bay. I. Soccoro, no. 34-32, 3 Jan. 1934. Nayarit, on surf-beaten rocks 

 of I. Maria Magdalena, Las Tres Marias, no. 39-633, 9 May 1939. 

 Ibid., dredged from sta. 970 at 22 meters' depth, no. 39-658, 9 May 1939. 

 Ibid., dredged from sta. 971 at 5.5-9.0 meters' depth, no. 39-668, 9 May 

 1939. Guerrero, at Ba. Petatlan, no. 34-571, 2 Mar. 1934. Oaxaca, 

 at Ba. Tangola-Tangola, nos. 34-550, 34-551, 28 Feb. 1934. Ibid., 

 district of Juquila, Conzatti no. 4481, 17 Dec. 1921 (Herb. N. Y. Bot. 

 Gard.). Costa Rica: Puerto Culebra, intertidal, no. 34-531, 24 Feb. 

 1934. Golfo Dulce, infrequent in rock crevices near the entrance to the 

 bay, no. 39-101, 26 Mar. 1939. Panama: Bahia Honda, on rocks near 

 low tide line, rare, no. 39-134B, 26 Mar. 1939. Colombia : Valle, on I. 

 Gorgona, no. 34-491 B, 12 Feb. 1934. Ecuador : Archipielago de Colon, 

 I, Isabela, Hassler Exped. no. 1016, June 1872. Ibid., on rocks at low 



