NO. 1 TAYLOR: PACIFIC MARINE ALGAE 201 



These plants have strong, tufted principal axes closely covered with 

 overlapping pinnate ultimate branches and are even denser than Collins' 

 Phyc. Bor.-Amer. no. 650B of his van densa. Occasionally basal shoots 

 resemble his Californian plants closely, but the tall ones are far more 

 developed, with at least one degree of short lateral branching. 



Mexico: Baja California, in the littoral pools at South Bay, I. Cer- 

 ros, no. 34-646B (TYPE), 10 Mar. 1934. 



Corallina vancouveriensis Yendo ? 



Yendol901,p. 719, pi. 54, fig.3. 



Mexico: Baja California, at Point Hughes on Cabo San Lazaro, 

 no. 34-610, 7 Mar. 1934. 



Corallina oflBcinalis Linnaeus 



Taylor 1937, p. 271, pi. 36, figs. 1-5. 



Ecuador : Archipielago de Colon, in pools in the lower littoral near 

 Black Beach Anchorage, I. Santa Maria, no. 34-240C, 17 Jan. 1934. 



Grateloupiaceae 



Plants with a flat blade, or bushy with terete branches variously di- 

 vided; structurally filamentous; sporangia tetrapartite, scattered or in 

 nemathecia; carpogenic branches two celled, the immersed cystocarp dis- 

 charging by a well-defined pore. 



KEY TO GENERA 



1. Thallus flat, soft, foliaceous or divided; sporangia scattered 2 



1. Thallus membranous; sporangia in nemathecia . . Cryptonemia 



1. Thallus branched, the firm divisions narrow; sporangia in nema- 

 thecia 4 



2. Cortex parenchymatous in section Halymenia 



2. Cortex of anticlinal cell rows 3 



3. Thallus flat, entire or lobed; cortex of rows of short rounded 

 cells, medulla of loosely forking filaments Aeodes 



3. Thallus flat, subsimple or variously branched; cortex of short 

 anticlinal filaments, the medullary filaments forming a network 



Grateloupia 



