154 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



V. cylindricum n. v.^^ 

 Plate 5, Fig. 1 



Plants small, creeping, the prostrate axes terete, 75 /x diam., bearing 

 on the upper side single or more or less clustered erect branches which if 

 sterile are generally thin, flat, ligulate to spatulate, 1-3 mm long, 0.2-0.5 

 mm broad, but if potentially fertile may elongate as terete filaments 75 [x 

 diam., to 1.3 cm long; growth from a single apical cell; axis in section 

 simple with a medulla of thicker-walled colorless cells, and 1-2 layers of 

 cells bearing chromatophores constituting a cortex which in surface view 

 shows cells in no regular order; tetrasporangial branchlets flat, occasion- 

 ally sessile, oval and 0.6 mm long, 0.24 mm broad, or more commonly on 

 terete stalks about 75 fi diam., to 1.2 cm tall; tetrasporangia scattered 

 irregularly throughout the sporangial area, young and old intermixed. 



This small form agrees in general with the smaller phase of this plant 

 as described by Feldmann and Hamel (1936, p. 236), but the tetraspo- 

 rangial blades, very small, are most commonly on long stalks. 



Ecuador: Esmeraldas, dredged in 5.4 meters near the northeastern 

 side of Bahia San Francisco, no. 34-490C (TYPE), 11 Feb. 1934. 



Gelidium isabelae n. sp.^'' 

 Plate 5, Figs. 8-12 



Plants small, creeping, dull purplish, the branching rhizome 160-250 

 IX diam., terete or a little compressed, irregularly and closely bearing dis- 

 coid haptera or erect, flat, stipitate foliar branches which are ligulate to 

 spatulate or lanceolate, obtuse, simple or occasionally sparingly pinnately 

 branched, 0.2-1.0 cm tall, in texture rather more fleshy than usual in 

 small gelidia, growing from a distinct apical cell, the surface cortical cells 

 rounded, in no regular order; rhizines present in the subcortical region; 

 tetrasporangia rounded, in sori in the upper ends of ordinary' branches, in 

 no definite arrangement. 



S9Gelidium pusillum v. cylindricum n. v.— Plantae rhizomatosae, laminis 

 stenlibus singulis aut fasciculatis, erectis, ligulatis ad spatulatas, tenuibus, 1-3 mm 

 long., 0.2-0.5 mm lat. ; ramis tetrasporangialibus sessilibus aut plerumque in stirpi- 

 bus teretibus, circa 75 [i diam., ad 1.2 cm long., partibus extremis planis ovatisque, 

 ad 0.6 mm long., 0.24 mm lat. Planta typica in loco dicto Bahia San Francisco, 

 Itsmeraldas, Ecuador, legit W. R. Taylor no. 34-490C, 11 Feb. 1934. 



90 Gelidium isabelae n. sp.— Plantae parvae, rhizomatosae, rhizomate tereti 

 aut paululum compresso, ferente haptera atque laminas erectas, stipitatas, ligulatas 

 ad spatulatas aut lanceolatas obtusaque, 0.2-1.0 cm alt., in textura quasi firme 

 carnosas; tetrasporangiis in soris in partibus superioribus ramorum ordinariorum. 

 Flanta typica in loco dicto Pta. Albemarle, I. Isabela, Ecuador, legit W. R. Taylor 

 no. 34-121, 12 Jan. 1934. 



