20 



PLANT LIFE. 



plants of this sort live almost entirely in water or in wet 

 places, and may be conveniently designated as \.\\t filayjienious 

 algcB. 



25. Spirogyra, etc. — x\mong these none are more beautiful 

 or interesting than the filamentous Conjugatte, represented in 



^^y^ 



Fig. 26. 



Fig. 24. — A cell from filament of Sj>7roL:-y-7^a. 



ch, chloroplast (there are three in this ceil) ; 



/, pyrenoids ; k, nucleus. Magnified 200 



diam. — After Strasburger. 

 Fig. 25. ^A cell from filament of Zygnoua, 



showing two stellate chloroplasts, in each of 



which is a pyrenoid, with the nucleus between 



them. Cytoplasm poorly shown. Magnified 



5';o diam — After Sachs. 

 Fig. 26. — Two cells from filament of Zygnema^ 



showing the gelatinous sheath greatly swollen. 



Magnified 245 diam. — After Klebs. 

 Fig. 24. 



our waters by the genera, Spirogyra^ Zyg7ie??ia, Mcsocarpus , 

 and some others. ^= They may be readily recognized, diirint^ 

 their vegetative period, by their unbranched filaments, bright 



^"To the Conjugatix- also belong the single-celled desmids already 

 described. 



