INTRODUCTION TO CKYPTOGAMIC BOTANY. 



113 



CeUs clividiug by a simple ( p^^„,,^^,,,, 

 ment. ( 



Cells dividiug by the for- 

 mation of two new cen- 

 tral half cells. 





Articulate. 



Zoospoi-( 

 minute. 





Zoospon 

 large. 



Inarticulate. Siphonece. 



Ulvacece. 



Besmidiacece. — Green. Cells free 



from silex. 

 Biatomacece. — Yellow-brown. Cells 



siliceous. 



Confervacece. — Without any com- 

 pound axis. Articu- 

 lations mostly longer 

 than their diameter. 



BatrachospermecB. — Threads partly 

 incorporated into a 

 solid axis. 



Hydrodictyce. — Reticulated. 



NostochinecE. — Threads very slen- 

 der, moniliform, in- 

 vested with mucus, 

 or surrounded by a 

 gelatinous mass. 



OscillatoricE. — Cells very narrow, 

 Threads free, fascicu- 

 lated, or compacted, 

 simple or branched 

 by apposition. 



/ Conjugutd. — Zoospores from the 

 union of two endo- 

 chromes, in the same 

 or contiguous threads, 

 or from division of a 

 single primary endo- 

 chrome. 



Bidbochceteoe. — Zoospores from divi- 

 sion of a secondary 

 impregnated endo- 

 chrome. 



