NO. 1 TAYLOR: PACIFIC MARINE ALGAE 139 



10. Thallus 2-3 mm wide, smooth, shiny; spinulose cells few, found 

 only on the thickened margins G. ventricosa 



11. Cortical tissue containing lobed cells, tristromatic ; plant low, 



f rutescent ; internodes less than 1 cm long . . . G. angustif rons 

 11. Cortical tissue without lobed cells, 3-4-stromatic ; plant tall, 



arborescent; internodes 1.0-2.5 cm long . . . . G. intermedia 



Galaxaura filamentosa Chou n. sp.^^a 

 Plants about 5 cm tall, dichotomous or subdichotomous, often irregu- 

 lar by reason of adventitious branches, lightly calcified, villous, the ex- 

 tended assimilatoiy filaments 1.0-4.5 mm long; axis of the internodes 

 0.5-1.5 mm diam., 2-10 mm long; structurally homogeneous, the medulla 

 of filaments 16-24 fi diam., the cortex not distinctly developed because 

 the assimilatory filaments do not have differentiated basal or supporting 

 cells; assimilators 18 /^ diam. near the base, 20-22 [x diam. above, the cells 

 1.5-3.0 diameters long. 



Mexico: Is. Revilla Gigedo, veiy abundant in tide pools on a rocky 

 point at Sulphur Bay, I. Clarion, no. 39-46 (TYPE), 17 Mar. 1939. 

 Costa Rica: in tide pools at Pto. Culebra, no. 34-533, 24 Feb. 1934. 

 Golfo Dulce, frequent on intertidal rocks near the western side of the bay 

 near the entrance, no. 39-93, 26 Mar. 1939. Ecuador: Archipielago de 

 Colon, in an inland salt lagoon near Albemarle Pt., I. Isabela, no. 34- 

 77^. 12 Jan. 1934. 



Galaxaura barbata Chou n. sp.^^^ 

 Plants bushy, to 5 cm tall, the holdfast broad, disciform; branches 

 terete, moderately calcified, fairly regularly dichotomous, with assimila- 



S2a Galaxaura filamentosa n. sp. — Planta 3.5-5.0 cm alta ad substratum disco 

 adfixa, frondibus teretibus cum filamentis assimilatoriis dense vestitis; dichotome 

 ramosis vel interpositione rami adventivi ut videatur trichotome ramosis; inter- 

 nodiis 2-10 mm longis, 0.5-1.5 mm crassis (filamentis liberis baud includensis) ; 

 thallo ex filamentis in parte media intertextis in parte exteriore paralielis constato 

 sed structura homogeneo sine cortice; filamentis axialibus 16-24 \x, diam., apice in 

 filamenta assimilatoria chromatophoria transeuntibus per cellulas sustinentes non 

 aut raro maleque differentiatas; absque cellulis basalibus tumidis; parte fila- 

 mentorum assimilatoriorum libera 1.0-4.5 mm longa, simpHci vel irregulariter 

 ramosa, ex cellulis cylindricis constante inferioribus 16-18 \x, diam., et superiorlbus 

 20-22 \i diam., sesquiplo vel triplo longioribus quam crassioribus. Planta typica in 

 loco dicto Sulphur Bay, I. Clarion, Mexico, legit W. R. Taylor no. 39-46, 17 Mar. 

 1939. 



82b Galaxaura barbata Chou, n. sp. — Plantae 5 cm altitudine; ramis teretibus, 

 0.5-1.0 mm diam., apice, siccato, collapso aut subancipiti; filamentis extensis 

 assimilativis barbatis, anulos spatio intermisso efiicientibus, filamentis medullati- 

 bus 6-20 \i diam.; tela corticea monostromatica, cellulis 32-50 \x. diam.; cellulis 

 stirpis 12-24 \i long., 10-18 \i diam., cellulis terminalibus 28-44 \i alt., 20-28 m. 

 diam., crebris, aspectu superficiali angularibus; filamentis assimulativis extensis 

 1-2 mm long., 16-18 \\, diam.; cellulis 1-5 plo diam. longitudine; cellulis basalibus 

 tumidis permagnis 90-120 n long., 28-40 [x diam. Planta typica in loco dicto I. 

 Santa Maria, Ecuador, legit W. R. Taylor no. 34-364, 27 Jan. 1934. 



