i:>i 



repeated; sur face of cortex smooth or lightly crenulate-mammil- 



late; epidermal cells of main axes heteromorphous, the longer 



linear-oblong and 



sinuous in surface 



wiew, 60 - 165 [J. 



long and 8-13 [j- 



broad (measuring 



lumina only), their 



walls irregularly 



thickened, mostly 



3-24 [X thick, the 



irregularities of 



thickening often 



giving the lumina 



a lobed or stran- 



gulated appearan- 



ce , the smaller 



cells irregularly 



ovai, oblong, or 



subquadrate, 8-40 



;j. long; epidermal 



cells of ultimate ramuli smaller and more uniform in size, mostly 



8-40 a long; cystocarps sessile, urceolate-ovoid, 0.9-1.5 mm. long,. 



0.75- i.i mm. in maximum width. 



In size, habit, and consistency of the frond, Laureiicia chilen- 

 sis bears some resemblance to Laurencia heteroclada Har\\, L. 

 Forsteri (Mert.) Grev., L. filiformis (Ag.) Mont., and L. scoparla 

 J. Ag., but appears to differ from ali in its brownish color, in 

 the irregularly thickened or often somewbat pitted walls of the 

 epidermal cells, in the heteromorphy of the epidermal cells of the 

 main axes, and in the proliferating habit of many of the ultimate 

 ramuli. In the other species apical innovations may occur as the 

 result of an obvious injury, but the repetition of segments of the 

 form and character of ultimate ramuli through apparently normal 

 marginai or subterminal proliferations has not observed in the 

 others. Kuetzing in bis Tabulae Phycologicae XV (1865) pag. 29, 

 tab. 83, fig. a-b has described and given figures of a new species 



Fig. 



Vegetative apex of the frond, >< io. 



