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66. Spores 34-48 i". x 48-54^1 93-
66. Spores 46-50^1 x 81-124 /a 94.
66. Spores 54-64 /x x 75-100 ju. 95-
67. Diameter vegetative cells 32-42 /a,
SPIROGYRA 137
'^' triplicata
.S. siamensis
'^- neglecta
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;". (second
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, chromatophores
4-(3-2) 98. 5. szechwanensis
70. Diameter spores 87-108 a^, chromatophores
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