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



THE GREEN ALGAE OF NORTH AMERICA.* 

 BY FRANK S. COLLINS. 



TABLE OF CONTENTS. 



PAGE 



INTRODUCTION 80 



CLASS HETEROKONT*.E. 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. Chlamydomonadaceae 128 



2. Volvocaceae 131 



3. Tetrasporaceae 136 



Order III. Protococcales _._ 142 



Family i. Protococcaceae 142 



2. Protosiphonaceae 153 



3.. Halosphaeraceae 154 



4. Scenedesmaceae . 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. 



