NO. 1 TAYLOR: PACIFIC MARINE ALGAE 301 



Polysiphonia bifurcata G. J. Hollenberg n. sp.^^^* 



Text Figure 2 



Plants 2-4 cm tall, pseudodichotomously branched; main branches 

 200-225 /A diam., composed of turgid segments 1.00-1.75 diameters long; 

 apical cells prominent, slender; pericentral cells 5, ecorticate; trichoblasts 

 wanting; tetrasporangia 80-90 /x diam., in short series, bulging consider- 

 ably and spiraling in the ultimate branches. Sexual plants and attachment 

 organs unknown. 



The most active growth is shown by no. 34-405, which is sterile, but 

 is far more representative as far as the characteristic forking tips are con- 

 cerned. In these forcipate tips the main axis is distinguished from the 

 branch chiefly by the shorter pericentral cells at the base of the latter. No 

 other species of Polysiphonia combines the characters of forcipate tips and 

 5 pericentral cells. A seemingly total lack of trichoblasts is an additional 

 feature of considerable interest. 



Costa Rica: dredged from 9-16 meters' depth off a bottom of sand 

 and mud, Playa Blancas, Schmitt no. 460A-35, 8 Feb. 1935. Ecuador: 

 Archipielago de Colon, dredged in som.e abundance from a depth of 92 

 meters off a sandy bottom at sta. 204 near an islet in Gardner Bay, I. 

 Espafiola, nos. 34-405, 34-410 (tetrasporic, TYPE), 31 Jan. 1934. 



Polysiphonia decussata Hollenberg 



Hollenberg 1942, p. 780, f^g. 6. 



Ecuador : Archipielago de Colon, intertidal on rocks to the north of 

 Tagus Cove, I. Isabela, no. 34-174, 13 Jan. 1934. 



Polysiphonia Hendryi Gardner 



Gardner 1927h, p. 101, pi. 24, figs. 1, 2, pi. 25; Smith 1944, p. 363, 

 pi. 93, figs. 3, 4. 



Mexico : Baja California, small tufted plants from the littoral. South 

 Bay, I. Cerros, no. 34-648, 10 Mar. 1934. 



I9ia Polysiphonia bifurcata G. J. Hollenberg n. sp.— Plantae 2-4 cm altitudine, 

 pseudodichotome ramosae; ramis primariis 200-225 \i diam., compositis e segmentis 

 turgidis 1.00-1.75 plo diam. longitudine; cellulis apicalibus prommentibus, tenu- 

 ibus; cellulis pericentralibus 5, ecorticatis; trichoblastis non repertis; tetraspo- 

 rangiis 80-90 M- diam., brevi in serie, aliquantum protuberatis et in ramis ultimis 

 convolutis. Plantis sexualibus et organis affixionis ignotis. Planta tvpica in loco 

 dicto Gardner Bay, I. Espafiola, Ecuador, legit W. R. Taylor no. 34-4W, 31 Jan. 

 1934. 



