1920] Sctchell-Gardner: CJilorophyceae 259 



the very similar E. plumosa. This interpretation of E. crinita is that 

 of J. G. Agardh {loc. cit.) who founds his opinion upon a specimen 

 determined by Rotli. 



14. Enteromorpha erecta (Lyng.) J. Ag. 



Frond filiform, with nuiucrous long, usually erect branches, more 

 slender than the main filament; the ultimate ramuli of varying length, 

 polysiphonous, the cells being symmetrically arranged in successive 

 segments, similar to those of Polysiphonia; cells in the main axes and 

 branches in longitudinal and usually in transverse series; chromato- 

 phore filling the cell. 



Rare on the Pacific Coast, known only from Vancouver Island 

 (Comox) and California (Santa Rasa Island). 



J. G. Agardh, Till Alg. Syst., part 3, 1883, p. 152 ; Collins, Green 

 Alg. N. A., 1909, p. 200. Scijtosiphon erectus Lyngbye, Hydr. Dan., 

 1819, p. 65, pi. 15 C. 



Enteromorpha erecta is to be distinguished from E. crinita by 

 having the tips of the branches polysiphonous instead of mono- 

 siphonous (ending in a single row of cells). It is to be distinguished 

 from E. plumosa in the same way as well as by having the chromato- 

 ])li()res filling the cells. By the latter character it is also to be dis- 

 tinguished from E. clathrata. 



J. G. Agardh (1883, p. 152) states that his Enteromorpha erecta 

 is the same as a specimen sent out by Dillwyn under the name of 

 Conferva paradox-a Dillwyn, but, since the description of Dillwyn 

 seems to him to have been made from another plant and Dillw;\'n's 

 figure ill drawn, he does not adopt Dillwj^n's specific name. It is 

 impossible for us to do more than call attention to this statement, 

 but it seems to us very probable that Dilhrv'n's specific name may be 

 llic i^roper one to be used for this plant. 



15. Enteromorpha plumosa Kuetz. 



Frond slender, filiform or later compressed, repeatedly branched, 

 branches tapering from the base and ending in a single series of cells; 

 cells in longitudinal series, less distinctly so in the older parts of the 

 frond, 8-10/x wide in the monosiphonous parts; chromatophore not 

 filling the cell. 



Floating in slightly brackish water. Washington (Puget Sound) 

 and California (San Francisco). 



