NO. 1 TAYLOR: PACIFIC MARINE ALGAE 133 



expanding to a flat ribbon 6-8 cells v/ide, the cells subquadrate, giving a 

 total width of 60 fi, of but one cell in thickness, the cells in fairly regular 

 rectilinear rows. 



Howe 1914, p. 77, pi. 29. 



The bases of these plants seem to consist of a few cells loosely ar- 

 ranged, but not in conspicuous disks as figured by Howe. This may be 

 merely a matter of the nature of the substratum. The Erythrotrichias 

 described by Gardner (1927a, pp. 238, 239), especially E. pulvinata, 

 show considerable resemblances, but E. pulvinata seems to be small and E. 

 Parksii v. minor much larger. 



Ecuador: Archipielago de Colon, a minor element among epiphytes 

 on Prionitis, which grew on surf-beaten rocks south of Black Beach 

 Anchorage, I. Santa Maria, no. 34-394 p.p., 30 Jan. 1934. 



PORPHYRA C. Agardh, 1824 

 Plant membranous, brownish, dull purplish or rose, often large, 

 attached by a small holdfast, expanding above into a soft slippery blade of 

 one or two cells in thickness; cells with a radiating chromatophore and 

 central pyrenoid, alike except near the base where they are extended into 

 intramatrical rhizoids to form the holdfast ; asexual reproduction by mo- 

 nospores ; sexual reproduction by spermatia formed by regular repeated di- 

 visions of the thallus cells and by simple carpogonia formed from vege- 

 tative cells by production of a short trichogyne ; fertilization resulting in 

 the formation of small scattered clusters of carpospores. 



Porphyra naladum C. L. Anderson 



Plants very small, from a cushion-shaped base, clustered, the blades 

 purplish red, somewhat oval, about 5 mm wide and 1 cm long. 



Hus 1920, p. 212, pi. 21, figs. 19-22; Smith 1944, p. 169, pi. 40, fig. 1. 



Mexico: Baja California, common in shallow water on eelgrass at 

 Point Hughes, Cabo San Lazaro, no. 34-665, 7 Mar. 1934. Costa Rica: 

 with Bangia on huge barnacles on rocks in the surf near low tide line, 

 Port Parker, no. 39-87, 25 Mar. 1939. 



Chantransiaceae 



Plants small, filamentous, with apical growth, the axes prostrate or 

 erect ; cell arrangement uniseriate, the cells uninucleate, with one to sev- 

 eral chromatophores ; asexual reproduction by mono-, bi- or tetraspo- 

 rangia; sexual reproduction when present by spermatangia on small, 

 branched spermatangial filaments and by carpogonia which constitute the 

 generally one-celled carpogenic branches, the cystocarps small. 



