Contents xi 



PAGE 



Order V. MICROSPORALES 100 



Family 1. Microsporaceae 100 



Microspora 



Order VI. CLADOPHORALES 101 



family 1. Cladophoraceae 102 



Chaetomorpha, Rhizoclonium, Cladophora, Chaetonella 



Family 2. Pithophoraceae 106 



Pithophora 



Family 3. Sphaeropleaceae 107 



Sphseroplea 



Order VII. SIPHONED 108 



Family I. Vaucheriaceae 109 



Vaucheria 



Order VIII. CONJUGATE 114 



Family 1. Zygnemaceae 116 



Sub-family I. MESOCARPE^E 117 



Mougeotia, Gonatonema 



Sub-family II. ZYGNEME^E 123 



Debarya, Zygnema, Spirogyra, Choaspis 



Family 2. Desmidiacese 135 



Sub-family I. SACCODERM^E 152 



Tribe 1. Gonatozygce . , . . . . . 152 



Gonatozygon, Genicularia 

 Tribe 2. Spirotceniece . . . . . . . 154 



Spirotsenia, Mesotsenium, Cyliudrocystis, Netrium 



Sub-family II. PLACODERM^E 156 



Tribe 3. Peniece 157 



Penium 

 Tribe 4. Closteriece ....... Iu7 



Roya, Closterium 



Tribe 5. Cosmariece 161 



Docidium, Pleurotsenium, Tetmemorus, Euastrum, 

 Micrasterias, Cosmarium, Xanthidium, Arthro- 

 desmus, Staurastrum, Cosmocladium, Oocardium, 

 Sphserozosma, Onychonema, Spondylosium, Hya- 

 lotheca, Desmidiurn, Gymnozyga 



Order IX. PROTOCOCCOIDE^ 178 



Family 1. Chaetopeltidese 180 



Chaetopeltis, Chsetosphseridium, Conochsete, Poly- 

 chsetophora 



