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SPIROGYRA 149
178. Chromatophores i to 3 179
178. Chromatophores 2 to 4 180
179. Median spore wall single 254. S. nawashini
179. Median spore wall double 255. S. tetrapla
180. Chromatophores (2-) 3-4, spore
diameter 45-75 M, aculeate-retic-
ulate 252. S. inconstans
180. Chromatophores 3-4, reticulate-
spinose 251. S. acanthophora
180. Chromatophores 2-4, spore diam-
eter 52-62 /a, mammillate-aculeate 253. S.borysthenica
180. Chromatophores 2, spore diam-
eter 42-50 Ai, median wall double 264, S.crassispina
181. Chromatophores 2 182
181. Chromatophores (i-)2-3, diameter
spore At, 45-60 median wall double. . . 256. S. reticulata
181. Chromatophores 4-3, diameter spore
52-71
ju., median wall double 258. S. crassivallicularis
182. Spores, diameter 39-45 fi, median
wall single, reticulate 257. S. regularis
182. Spores, diameter 45-55 M, median
wall double, inner granulate 259. S. granulata
182. Spores, diameter 51-55/^, median
and outer walls double 260. S. quinquelaminata
182. Spores, diameter 46-68 a^, median
wall double, reticulate 261. S. pseudogranulata
REPRODUCTION WHOLLY OR MOST COMMONLY BY APLANOSPORES
183. End walls plane 184
183. End walls semireplicate, diameter veg-
etative cells i2-i/\fj- 198. S. narcissiana
183. End walls replicate, diameter vegeta-
tive cells 24-28 Ai 234. S. articulata
184. With I chromatophore 185
184. With 2 or more chromatophores 186
185. Sporangia cylindric, aplanospores
ovoid 31- '^- oltmannsii
185. Sporangia enlarged or slightly inflated 29. S. mirabilis
185. Sporangia and sterile cells often in-
flated 38. 'S. aplanospora
186. With 2 to 3 chromatophores in
each cell, spores ellipsoid 65. 5. maravillosa