NO. 1 TAYLOR : PACIFIC MARINE ALGAE 235 



Gracilaria brevis n. sp.^*2 

 Plate 37, Fig. 2 



Thallus to 5 cm tall, or perhaps more, fairly regularly to 6 times 

 dichotomously branched, the axis 1-2 mm diam., subterete below, the 

 branches strap shaped, 3-10 mm broad, 180-250 /x thick (partly soaked 

 up) , at the apices rounded or retuse ; structurally showing a broad medulla 

 of large cells 40-120 fx diam., in the center, toward the surface consider- 

 ably smaller, the cortex of a layer of rounded cells 3-9 fi diam., with thick 

 walls between them, the outer cuticle 3-10 fx thick; cystocarps superficial, 

 the pericarps contracted below but sessile, the walls thick, of cells in 

 radiating rows ; cystocarp basally attached, with a large expanded central 

 sterile tissue. 



Ecuador : Guayas, occasional in tide pools, Pta. Santa Elena, Schmitt 

 no. 524 (cystocarpic, TYPE), 17 Sept. 1926. 



TYLOTUS J. Agardh, 1876 



Tylotus ecuadoreanus n. sp.^^^ 

 Plate 69, Fig. 1 



Plants tufted, to 9 cm tall from a small discoid holdfast, profusely 

 branched, when dry dull purple, darker toward the margins and more 

 glaucous toward the center of the segments ; short stalked, above flat and 

 irregularly dichotomously branched at intervals of 0.5-1.5 cm, somewhat 

 tapered toward the upper segments, to about 5 mm wide below, 1-2 mm 

 in the terminal branchlets, the tips blunt; in structure showing a paren- 

 chyrhatous medulla of a few layers of large cells ; tetrasporangia produced 

 in ill-defined sori first formed near the branch tips and not extending the 

 full width of the branch, these sori being left behind as the tips grow and 

 divide, and gradually becoming decorticate as the sporangia are dis- 

 charged, so that the thallus bears many pale roughened spots; sporangia 

 tetrapartite, oval, 24-28 /i diam., dispersed among paraphysal extensions 

 of the cortex cells which develop in tiers of about 3 cells, the total length 

 being about 45 fi; cystocarps scattered sparingly over the female plants, 



142 Gracilaria brevis n. sp. — Planta ad 5 cm altitudine; ad sexies dichotome 

 furcata, axe infra 1-2 mm diam. et subterete, supra complanato et 3-10 mm lat., 

 180-250 fx (vel plus ?) crassitudine; apicibus rotundatis aut retusis, cystocarpis 

 superficialibus prominentibusque. Planta typica in loco dicto Pta. Santa Elena, 

 Ecuador, coll. W. L. Schmitt no. 52i, 17 Sept. 1926. 



143 Tylotus ecuadoreanus n. sp. — Plantae ad 9 cm altitudine, profuse ramosae, 

 supra planae et irregulariter dichotome intervallis 0.5-1.5 cm, segmentis infra ad 

 5 mm lat., supra 1-2 mm lat., cacuminibus obtusis; tetrasporangiis 24-28 |x diam., 

 in soris male definitis, ad cacumina ramorum primo formatis; cystocarpis promi- 

 nentibus, basira contractam atque pericarpum ostiolatum habentibus. Planta typica 

 in loco dicto I. Santa Maria, Ecuador, legit W. R. Taylor no. 34-270, 18 Jan. 1934. 



