INTRODUCTION TO OKYPTOQAMIC BOTANY. 



113 



o 



Cells dividing by tlie for- 

 mation of two new cen-( 

 tral half cells. 



"^ 

 s" 



i 



Articulate. 



Zoospores, 

 minute. 



^CeUs dividing by a simple \p^i^,Uece. 

 dissepiment. f 



Desmidiacecs. — Green. Cells free 

 from silex. 



Diatomacecs. — Yellow-brown. Cells 

 sUiceous. 



Confenacece. — Without any com- 

 pound axia. Articu- 

 lations mostly longer 

 than their diameter. 



Balrachospermeos. — Threads partly 

 incorporated into a 

 solid axis. 



Hydrodictyae. — Beticulated. 



NostockinecE. — Threads very slen- 

 der, moniliform, in- 

 vested with mucus, 

 or surrounded by a 

 gelatinous mass. 



OsnllatoricE. — Cells very narrow, 

 Threads free, fascicu- 

 lated, or compacted, 

 simple or branched 

 by apposition. 



Conjugate. — Zoospores from the 

 union of two endo- 

 chromes, in the same 

 or contiguous threads, 

 or from division of a 

 single primary endo- 

 chrome. 



£ttZJocS«<ece.— Zoospores from divi- 

 sion of a secondary 

 impregnated endo- 

 chrome. 



Zoospores, 

 large. 



Inarticulate. Siphonece. 



o — , 



g 8 



I- 



Ulvacece. 



