1920] 8etcheil-Gard'iier : Chlorophyceae 257 



10. Enteromorpha marginata J. Ag. 



Frond filiform, compressed, simple or with a few proliferous 

 branches ; cells 4-8/a diam., squarish, arranged in longitudinal series, 

 very distinctly in the two or three rows at each side, less so in the 

 middle portion. 



Vancouver Island (Departure Bay) to California. 



J. G. Agardh, Algae Med., 1842, p. 16 ; Collins, Green Alg. N. A., 

 1909, p. 202, Mar. Alg. Vancouver Is., 1913, p. 102. 



Enteromorpha marginata is a very slender plant, usually of salt 

 springs or salt marshes. It is most commonly simple and of low 

 stature. It is credited to our coast by Collins {loc. cit.), but we have 

 had no specimens for examination. 



11. Enteromorpha salina var. polyclados Kuetz. 



Frond small, tubular, with occasional branches similar to the main 

 filaments, all beset with short, spinelike, patent ramuli ending in a 

 single series of cells and varying from few in some specimens to ^ery 

 numerous in others; cells squarish, arranged in longitudinal series. 



Floating in tangled masses in salt-water ponds. Central Cali- 

 fornia. 



Kuetzing, Phyc. Germ., 1845, p. 248; Collins, Green Alg. N. A., 

 1909, p. 202. Enteromorpha polyclados Kuetzing, Tab. Phyc, vol. 6, 

 1856, pi. 36, II. 



We have encountered floating in sun-heated pools in the salt 

 marshes or in the artificially wanned water of the Key Route Pool, 

 but all in the neighborhoods of Oakland and Alameda, California, what 

 seems to be the above listed variety of Enteromorpha salina. Our 

 plants are slender, with few or no main branches, cells squarish and 

 in distinct longitudinal rows, and beset with branchlets consisting of 

 one or two longitudinal rows of cells throughout. The main portions 

 of the broader fronds sometimes show as many as twenty cells across, 

 but there are only four to eight to be seen in the more usual slender 

 fronds. We have referred all our plants to the variety but some show 

 details of structure exactly corresponding to those of the species (cf. 

 Kuetzing, 1856, pi. 36, f. I). 



