NO. 1 TAYLOR: PACIFIC MARINE ALGAE 61 



long-lanceolate blade reaching 15 mm in length, 3 mm in width, or not 

 infrequently irregular; axis 130-370 fx diam., pinnules 55-130 /u, diam. 



From B. pennata these plants may be differentiated by their much 

 lighter green color, for B. pennata is dark green and the plants commonly 

 iridescent in the water. They are also, so far as these collections go, smaller 

 and with shorter pinnules, although the transverse dimensions of the axis 

 and pinnules are not distinctive; it is a parallel species but apparently 

 descends into deeper water than the Caribbean counterpart. The pinnules 

 average one third the diameter of the axis when fully developed, and vary 

 little from this ratio. The axis in B. pennata may be as much as three 

 times the diameter of the pinnules in the ramelliferous portions, but is 

 often hardly more than twice as wide. From B. pennatula J. Agardh 

 these differ in size, in the much greater portion of the axis which is 

 pinnate, the longer pinnules, and in the relative diameters of the axis and 

 pinnules. 



Mexico: Is. Revilla Gigedo, dredged at sta. 129 from 25-32 meters 

 at Braithwaite Bay, I. Soccoro, no. 34-17 ^ 3 Jan. 1934. Ibid., dredged 

 from 45 meters at sta. 135 off Sulphur Bay, I. Clarion, no. 34-46B, 5 Jan. 

 1934. Colombia: Valle, at I. Gorgona (axis to 450 /u, diam.), no. 34- 

 495 A, 12 Feb. 1934. Ecuador: Archipielago de Colon, intertidal in 

 pools, I. Wenman, no. 34-83 (TYPE), 1 1 Jan. 1934. Ibid., moderately 

 frequent on sand near large rocks at about low tide line, Pta. Albemarle, 

 I. Isabela, no. 34-108, 12 Jan. 1934. Ibid., dredged from 14-18 meters 

 at sta. 193 of? Post Office Bay, I. Santa Maria, no. 34-367, 27 Jan. 1934. 



Bryopsis pennatula J. Agardh 



Kiitzing 1856, p. 27, pi. 76, fig. 2. 



Plant to 5 cm tall, light green and soft, entangled below, the erect 

 axes sparingly branched, 220-370 ju, diam., bearing pinnules near the tip 

 where sometimes distichous for a distance of 3 mm, and in sparse inter- 

 rupted series below, where more often unilateral and irregular; pinnules 

 very short, 0.5-0.75 mm long, markedly contracted at the base and above 

 it thick, 150-185 fi diam. 



These somewhat matted plants hardly appear to be ramelliferous 

 until closely examined, and indeed are very sparingly so. They are cer- 

 tainly the B. ramulosa of Farlow (1902, p. 89), for authentic material 

 from the Farlow Herbarium has been compared. However, B. pennatula 

 J. Ag. and B. ramulosa are not synonyms, and B. pennatula as figured by 

 Kiitzing (loc. cit.) is pinnate only near the tips, with the pinnules about 

 half as wide as the axis. Our plants are much taller than those Kiitzing 

 figures, but that may not be significant. 



