HOW TO KNOW THE FRESH-WATER ALGAE 



249b Multicellular hairs resulting from the apical tapering of branches. 

 Fig. 177 STIGEOCLONIUM 



Fig. 177. a, Stigeoclonium flagelliferum 

 Kuetz.; b, cell showing laminate chlo- 

 roplast and pyrenoid. 



There are several species of this 

 genus which are differentiated by size, 

 by order of branching and by the mor- 

 phology of the thallus as a whole, some 

 forming long, graceful tufts, others 

 more bunched growths, with part of the 

 thallus prostrate. 



250a Growing in the mucilage of other algae. Fig. 178. . .CHAETONEMA 



Fig. 178. Chaetonema 

 irregular e Nowak. a, 

 branches containing 

 antheridial cells; b, 

 oogonium. 



There is only 1 spe- 

 cies of this genus 

 known, rather rarely 

 seen because its habi- 

 tat is the gelatinous 

 matrix of highly branched algae such as Chaetophora (Fig. 196). 



Figure 178 



250b Growing or creeping on the walls of larger algae. See Fig. 161. 

 APHANOCHAETE 



113 



