LEMANEA. 51 



Class L RHODOPHYCE^S. 

 Order L FLOKEDLE. 



Plants rosy red or purple, dark reddish brown or blackish; 

 multicellular, various in form ; crustaceous, filamentous, fasci- 

 culate, verticillately branched, etc. 



Propagation sexual. The female cell (carpogon) bears a longer 

 or shorter appendage, called the trichogyne. This is fer- 

 tilized by very small granules (spermatozoids or anthorizoids) 

 derived from cells at the ends of short branches or from certain 

 spots or nests (antheridia) in the thallus. These spermatozoids 

 float about in the water, find their way to the trichogynes, attach 

 themselves and fructify the carpogon. 



Asexual propagation takes place by means of gonidia which 

 are evolved in cells similar in location and in appearance to the 

 carpogons. 



Family I. LEMANEA CEJE. 



Filaments simple or sparsely branched, hollow, more or less 

 nodose, rigid, bristle-like, light olive-brown, gray, or with age 

 almost black. Carpospores collect at intervals within the 

 filament. 



Genus 1, LEMANEA. 



Filaments rather large, 1 to 5 inches long, nodose of dark 

 olive or blackish color, forming tufts most frequently on rocky 

 beds of streams whose current is rapid and cool. Carpospores 

 numerous, collected in branched moniliforni series within the 

 nodes. The fertile filaments are hollow except an axillary thread 

 composed of a single series of cells held in position by trans- 

 verse threads at regular intervals. The walls of the filaments 

 are thick, composed of two distinct layers of cells. 



LEMANEA TOEULOSA (Eoth.) Ag. 



Fertile filaments curved like a sickle or a bow, sub-simple, 

 cartilaginous and rigid, 1-2 inches long, light olive-green, 

 changes to darker color, with age nearly black ; nodules 

 not always well defined, approximate, papillae flattened 

 and often almost obsolete, mostly 4-6 verticillate ; spores 



