DESMIDS, DIATOMS, AND FRESH-WATER ALG^E. 109 



their ends bearing a fine, colorless hair or bristle. Tin- 

 der a low -power objective the plant, if carefully flat- 



rig. 89. Chsetophora elegans. 



tened out, is very beautiful, 

 gant." Ch. elegans, Fig. 89. 



It is justly named " ele- 



8. DRAPAUNALDIA (Fig. 90). 



There need be no trouble in recognizing this Alga. 

 It grows attached to many objects, the fine branches 

 giving it a delicate feathery appearance to the naked 

 eye. Under the microscope it is seen to be much 

 branched, the branches being arranged in clusters, and 

 formed of cells smaller than those of the main stem, and 

 filled with chlorophyl, while each terminal cell is ended 

 by a long, colorless hair. The cells of the stem are but 

 little longer than wide, and are colorless except for a 

 narrow, light green chlorophyl band surrounding the 

 centre. D. glomerate^ Fig. 90. 



