TUFTS COLLEGE STUDIES, Vol. II, No. 3. 



THE GREEN ALGAE OF NORTH AMERICA.* 

 BY FRANK S. COLLINS. 



TABLE OF CONTENTS. 



PAGE 



INTRODUCTION . . 80 



CLASS HETEROKONTAE. 92 



Order I. Confervales 92 



Family i. Confervaceae 92 



2. Botrydiaceae ' 97 



3. Chlorotheciaceae 99 



CLASS CHLOROPHYCEAE. 100 



Order I. Conjugates 101 



Family i. Desmidiaceae (omitted) 101 



2. Zygnemaceae . 102 



3. Mesocarpaceae 121 



Order II. Volvocales 127 



Family i. Chlamydomouadaceae 128 



2. Volvocaceae 131 



3. Tetrasporaceae 136 



Order III. Protococcales 142 



Family i. Protococcaceae 142 



2. Protosiphonaceae 153 



3. Halosphaeraceae 154 



4. Scenedestnaceae 155 



5. Hydrodictyaceae 175 



Order IV. Ulotrichales ^ 180 



Family i. Ulotrichaceae ..." 180 



2. Ulvaceae 195 



3. Prasiolaceae 217 



4. Cylindrocapsaceae 222 



5. Oedogoniaceae 222 



6. Chaetophoraceae 275 



"Contributions from the Harpswell Laboratory of Tufts College, No. 32 



