THE ALG^ 411 



Frond flattened, the membranes united except for a small space at 

 the margin. 



Enteromorpha linza. forma lanceolata J. Ag. 



Yakutat Bay (232). 

 Margins smooth and even. 



Enteromorpha linza. forma crispata J. Ag. 



Sitka (156). 



Margins and often the whole frond crisped and wavy. 



This species connects the genera Enterojyiorpha and Ulva and has 

 perhaps been oftenest placed in the latter ; but its affinities seem to be 

 more with the present genus. 



Enteromorpha intestinalis (L.) Link. 



Metlakatla, Annette Island (37). 



Frond simple or with a few proliferations at the base, usually en- 

 larged upward; cells arranged in no definite order, 6-12 ix wide, in 

 cross section radiate, 16-30 /-t long, the membrane about twice as thick 

 as the cell length in cross section. 



Enteromorpha intestinalis ybr/^a cylindracea J. Ag. 



In a protected sandy pool, Kukak Bay with fortna maxima (316) ; 

 Sand Point, Popof Island (382). 



The frond is long, slender, and of nearly uniform diameter through- 

 out its length. 



Enteromorpha intestinalis y£>r;;m maxima J. Ag. 



Orca (311) ; Kukak Bay, Wx'Cn. forma cylindracea (316) ; Victoria, 

 British Columbia, a -form with small cells and thin membrane, ap- 

 proaching E. Tninima (12). 



Frond much inflated, usually contorted. 



Enteromorpha micrococca Kuetz. 



On cliff, Orca (305) ; Shumagin Islands (398). 



Frond simple, tubular, of small size, much contorted ; cells 4-5 /a 

 in diameter; in membrane 18—20 11 thick. 



This species usually grows in dense masses on rocks between tide 

 marks. 



Enteromorpha prolifera (Muell.) J. Ag. 



Annette Island (35). 



Frond more or less abundantly branched ; branches like main frond, 

 not much smaller ; cells arranged in longitudinal series in all but the 

 oldest parts of the frond. 



These specimens have few branches. 



