332 THE PLANT PHYLA 



Class 2. HOLOPLASTIDEAE. With nuclear membrane. 



(Sp. about 20.) 



Order GLAUCOCYSTALES. Dividing in one plane. 

 Family 16. Glaucocystaceae. Glaucocystis. 



Phylum II. CHLOROPHYCEAE. The Simple Algae 



Normally chlorophyll-green, with well-developed single cells, 

 or filaments. (Here restricted to two 

 classes of green algae) . 



Class 3. PROTOCOCCOIDEAE. Green Slimes. Unicellu- 

 lar. (Sp. about 450.) 

 Order PALMELLALES. Cells not in colonies. 



Family 1. Protococcaceae. No zoospores. Proto- 



coccus, Trochiscia, Crucigenia. 

 Family 2. Chlorococcaceae.With zoospores. Chloro- 



coccum, Tetraspora. Botryococcus. 

 Family 3. Synchytriaceae. Colorless parasites. 



Olpidium, Synchytrium. 

 Order COENOBIALES. Cells in colonies. 



Family 4. Hydrodictyaceae. Vegetative cells not cili- 

 ated. Scenedesmus, Hydrodictyon. 

 Family 5. Volvocaceae. Vegetative cells ciliated. 

 Gonium, Pandorina, Volvox. (Ani- 

 mals!) 

 Class 4. CONFERVOIDEAE. Confervas. Filamentous, or 



a plane. (Sp. about 640.) 

 Order MICROSPORALES. Unbranched. 



Family 6. Microsporaceae. Microspora. 

 Order SCHIZOGONIALES. Unbranched. 



Family 7. Prasiolaceae. Prasiola. 

 Order ULVALES. Plant a plane or tube. 



Family 8. Ulvaceae. Ulva, Enteromorpha. 

 Order CHAETOPHORALES. Usually branched. Zoospores 



and ciliated gametes. 



Family 9. Ulotrichaceae. Unbranched. Ulothrix. 

 Family 10. Chaetophoraceae. Branches attenuated 

 into hairs. Draparnaldia, Chaeto- 

 phora. 



Family 11. Microthamniaceae. Scarcely attenuated, 

 no hairs. Microthamnion. 



