NO. 1 TAYLOR: PACIFIC MARINE ALGAE 223 



Sarcodiotheca tenuis n. sp.^^^ 

 Plate 74, Fig. 2 



Plants to about 7.5-10.0 cm tall, thin, fleshy membranous, rose red, 

 from a brief cylindrical stalk expanding to a 5-6-times dichotomous thallus 

 with segments 5-7 mm broad, somewhat tapering down to each fork, the 

 angles 60°-90° with rounded sinuses, the tips divergent, generally acute; 

 structurally with a scanty filamentous medulla, an inner cortex of about 

 two layers of thin-walled cells, the innermost large and the outer assimi- 

 latory cortex of one layer of cells 14-20 fi diam. which are angular in 

 surface view with a firm wall ; cystocarps marginal, sometimes appearing 

 minutely pedicellate, ostiolate, spherical to pyriform, the surrounding 

 wall with a moderately thick parenchymatous outer tissue not showing 

 particularly regular arrangement of the oval cells which compose it, and 

 a thin filamentous inner layer; spore mass spherical with a sterile center 

 of cells larger within, smaller without, connected with the wall tissue by 

 a few filaments, completely surrounded by short gonimoblasts 2-3 cells 

 long. 



This proposed new species differs somewhat from the others in the 

 shape of the thallus, but most definitely in the texture, the thallus being 

 extremely thin and delicate for plants of this group, soaking up to about 

 150 ju, thick, and when dry not adhering well to paper except at the tips 

 of the branches. 



Ecuador: Archipielago de Colon, dredged in 27 meters off Post 

 Office Bay, I. Santa Maria, no. 34-271A (TYPE), 19 Jan. 1934. 



Sarcodiotheca divaricata n. sp.^^^ 

 Plate 74, Fig. 1 



Plants to 15 cm tall, spreading and bushy, dull purplish red, rather 

 firm and crisp in texture, adhering well to paper on drying; flat through- 

 out except at the attenuate tips, 8-12 times dichotomously branched at 

 angles of 80°- 100°, the segments 2-4 mm broad below, generally about 

 1 mm in the divaricate tips; soaking up to 0.25 mm thick, but much 



134 Sarcodiotheca tenuis n. sp.— Plantae ad 7.5-10.0 cm altitudine, stipite brevi, 

 thallo 5-6-dichotome ramoso, carnoso-membranaceo, segmentis supra 5-7 _mm lat., 

 ad omnem furcara deorsum attenuatis, cacuminibus divergentibus, acutis; pen- 

 carpis marginalibus, aspectu minute pedicellatis, ostiolatis, sphericis ad pynformes. 

 Planta typica in loco dicto I. Santa Maria, Ecuador, legit W. R. Taylor no. 34- 

 271A, 19 Jan. 1934. 



135 Sarcodiotheca divaricata n. sp.— Plantae ad 15 cm altitudine, textura firmae 

 crispaeque, 8-12-dichotome ramosae angulis latis, segmentis infra ad 2-4 mm lat., 

 in cacuminibus divaricatis 1 mm latis; ad 250 \i crass. Planta typica m loco dicto 

 I. Santa Cruz, Ecuador, legit W. R. Taylor no. 34-316, 20 Jan. 1934. 



