NO. 1 TAYLOR: PACIFIC MARINE ALGAE 37 



DESCRIPTIVE CATALOGUE 

 Ghlorophyceae 



Grass-green plants, unicellular, colonial, filamentous, parenchymatous 

 or coenocytic, of veiy varied forms; pigments chiefly chlorophyll and 

 xanthophyll contained in definite chloroplasts ; sexual and asexual plants 

 generally morphologically similar; asexual reproduction by various types 

 of spores, most commonly biflagellate zoospores; sexual reproduction by 

 biflagellate isogametes or with various degrees of sexual specialization 

 and differentiation. 



Ulvaceae^® 



Plants membranous or tubular, of one or two layers of cells, in size 

 moderate to large, and generally found in or near the littoral ; reproduc- 

 tion from little-modified cells producing biflagellate gametes or zoospores. 



KEY TO GENERA 



1. Plants tubular in section, the wall one cell layer thick . . . 

 Enteromorpha 



1. Plants membranous and expanded when mature .... 2 



2. Membrane characteristically of one cell layer . . . Monostroma 

 2. Membrane of two cell layers throughout Ulva 



ENTEROMORPHA Link, 1820 



Plants simple or alternately branched, tubular or with the branches 

 ending in uniseriate tips; capillary to broad; attached or becoming free 

 floating; tube with a wall one cell in thickness, the cells usually close 

 placed, with a single lateral chromatophore generally containing one 

 pyrenoid. 



KEY TO SPECIES 



1. Plants simple or very sparingly branched 2 



1. Plants clearly, generally abundantly, branched . ... 3 



39 In order to conserve space, the descriptions of genera and larger categories 

 have been shortened in this report in many cases. This has chiefly meant an abridge- 

 ment of the description of reproductive organs, and chiefly affects the Rhodophy- 

 ceae. More detailed descriptions may be found in the writer's 1937 and 1942 

 publications. 



