230 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



KEY TO SPECIES 



1. Cylindrical throughout 2 



1. Slightly compressed above, and especially below the forks , 3 



1. Flattened or foliaceous 4 



2. Main axes slender, sparingly divided, but vt^ith many very slender 

 shorter lateral branches G. confei-voides 



2. Main branches coarse, reaching 3 mm diam., simple or sparingly 

 branched from near the base G. panamensis 



3. Branching dichotomous G. cerrosiana 



3. Branching at least in part pinnate G. pinnata 



4 Segments thicker, fleshy to subcartilaginous 5 



4. Segments broad, thin but fleshy; dichotomous to polychotomously 

 forked at wide angles 7 



5. Plants less than 1 dm tall, segments narrower 6 



5. Plants large, over 1 dm tall, the segments erect, to 1.5 cm broad 

 above the forks, and wider than below them . . . G. Johnstonii 



6. Lower segments narrow, little broader than the acute-tapering 

 end segments G. linearis 



6. Lower segments broad, to 1 cm or more, rapidly decreasing in 

 width toward the obtuse to acute end segments . G. Skottsbergii 



7. Segments 1-6 times as long as broad, the branch apices somewhat 

 narrowed G. tenuifolia 



7. Segments 1-3 times as long as broad, at wider angles, the apices 



broadly rounded truncate G. brevis 



Gracilaria confervoides (L.) Greville 



These plants belong to the elongate form of the species sometimes 

 called f. longissima Harvey. 



Mexico: Is. Revilla Gigedo, dredged from 56-102 meters' depth at 

 sta. 921 near I. Clarion, no. 39-43, 17 Mar. 1939. Ibid., dredged at sta. 

 129 from 25-36 meters' depth off Braithwaite Bay, I. Soccoro, no. 34-12 

 (tetrasporic), 2 Jan. 1934. Ibid., dredged from 41-84 meters' depth at 

 sta. 924, no. 39-65, 18 Mar. 1939. Ecuador: Guayas, on the north- 

 west beach near Pta. Santa Elena, Salinas, no. 34-451 A (cystocarpic), 

 8 Feb. 1934. Ibid., dredged from 11 meters, Ba. Salinas, Schmitt no. 

 481 A-35,nYth. 1925. 



