SPIROGYRA 137 



66. Spores 34-48 i". x 48-54^1 93- '^' triplicata 



66. Spores 46-50^1 x 81-124 /a 94. .S. siamensis 



66. Spores 54-64 /x x 75-100 ju. 95- '^- neglecta 



67. Diameter vegetative cells 32-42 /a, 



spores 31-40 /A (outer wall single) 96. 5. decimina 



67. Diameter vegetative cells 38-44 /a, 



spores 40-44 /i (outer wall single) 9']- ^- pi^na 



67. Diameter vegetative cells 40-50;". (sec- 

 ond outer spore wall hyaline, scro- 

 biculate) /\i. S. occidentalis 



68. Vegetative cells usually less than 75 m in diameter 69 



68. Vegetative cells usually more than 75 m in diameter 70 



69. Chromatophores 3, diameter vegeta- 

 tive cells 55-67 /A 95- '^- neglecta 



69. Chromatophores 3-4, diameter vege- 

 tative cells 60-78 M (spore usually ellip- 

 soid) 80. 5. nitida 



70. Diameter spores 57-68 /x, chroma- 

 tophores 4-(3-2) 98. 5. szechwanensis 



70. Diameter spores 87-108 a^, chro- 

 matophores 3 to 4 99. 5. jugalis 



71. Vegetative cell diameter 100-120 /x, 



chromatophores 13-15 100. S. margaritata 



71. Vegetative cell diameter 1 50-1 89 /x, 



chromatophores 12-14 loi. 5. polytaeniata 



72. In each cell 2 chromatophores 73 



72. In each cell 2 or 3 chromatophores 74 



72. In each cell 4 to 6 chromatophores 102. S.jaoensis 



73. Zygospores ellipsoid, diameter vegeta- 

 tive cells 20-24/". 103. S. baileyi 



73. Zygospores ellipsoid, diameter vegeta- 

 tive cells 44-48)" 104. S. buchetii 



73. Zygospores ellipsoid, diameter vegeta- 

 tive cells 60-75 /A ^°5- ^- bichromatophora 



74. Diameter vegetative cells 26-28 /a, 



chromatophores 2 to 3 106. S. rhizoides 



74. Diameter vegetative cells 40-50 a^, 



chromatophores 2 to 3 107. S. dubia 



74. Diameter vegetative cells 55-67 m, 



chromatophores 3 95- '^- neglecta 



