CONTENTS xi 



CHAPTER VIll 

 Phylum II. CHLOROPHYfEAE: Simple Algae 



Page 

 CJeneral Characters. Two Classes. Green Slimes; Palinel- 

 lales; Coenohiales. Confervas; Ulothrix; Oedop;oniiun; 

 Disk Algae 170 



CILVPTER IX 



Phylum III. Zygophyceae: Conjugate Algae 



General Characters. Two Classes. Pond Scums; Desmids. 



Diatoms. Origin of ZygophA^ceae 177 



CHAPTER X 



Phylum IV. Siphonophyceae: Tube Algae 



General Characters. Lower Tube Algae; Water Flannel; 

 Green Felts. Tube Fungi; Water Molds; Downy Mil- 

 dews; Black Molds; Insect Fungi. Higher Tube Algae; 

 Bladder Algae; Sea Ferns; Sea Umbrellas; Stoneworts. 

 Summary 184 



CHAPTER XI 



Phylum V. Phaeophyceae: Brown Algae 



General Characters. Origin. Ectocarpus. Kelps. Rock- 

 weeds. Gulfweeds 199 



CHAPTER XII 



Phylum VI. Rhodophyceae: Red Algae 



General Characters. Cell-walls. Color. Reproduction. 

 "Laver." Nemalion. Corallina. Polysiphonia. "Irish 

 Moss" 205 



