332 THE PLANT PHYLA 
Class 2. HOLOPLASTIDEAE. With nuclear membrane. 
(Sp. about 20.) 
Order GuaucocysTaLes. Dividing in one plane. 
Family 16. Glaucocystaceae.—Glaucocystis. 
Phylum Il. 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. GreenSlimes. 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 
aplane. (Sp. about 640.) 
Order MicrosporaLes. Unbranched. 
Family 6. Microsporaceae.—Microspora. 
Order Scu1zoGoNniALes. Unbranched. 
Family 7. Prasiolaceae.—Prasiola. 
Order Utvaues. Planta 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. 
