146 ZYGNEMATACEAE 



144. Zygospores 21-30/x x 30-So/i 207. S.weheri 



144. Zygospores 35-46/1 x 61-106^... 208. S.semiornata 



145. Diameter vegetative cells less than :;5/x 146 



145. Diameter vegetative cells more than 35 m 147 



146. Vegetative cell diameter 25-27 /a. 236. S.venusta 

 146. Vegetative cell diameter 28-34/^. 237. S.protecta 



147. Cell diameter 36-40 /x 238. S. cleveana 



147. Cell diameter 42-56/1 239. 5. denticidata 



148. Vegetative cell diameter usually less than 20/1 149 



148. Vegetative cell diameter usually more than 20/1 152 



149. Median spore wall not smooth 151 



149. Median spore wall smooth 150 



150, Diameter vegetative cells 8-13/Ji. 200, S.tenuissima 

 150. Diameter vegetative cells 15-20/1 201. S.inflata 



151. Diameter vegetative cells 11-13M, fer- 

 tile cells inflated 21:,. S. rugosa 



151. Diameter vegetative cells 13-17/s fusi- 

 form-inflated fertile cells 215. S. {intsamoensis 



151. Diameter vegetative cells 16-20 /<, fusi- 

 form-inflated fertile cells 216. S. discrcta 



151. Diameter vegetative cells 15-20/Ji, 



cylindric-inflated fertile cells 217. S. amplectens 



152. Median spore wall smooth 153 



152. Median spore wall not smooth 157 



153. Zygospores ellipsoid 154 



153. Zygospores ovoid 155 



154. Diameter vegetative cells 18-24/1 226. S.spreeiana 

 154. Diameter vegetative cells 24-30/1 206. S.farlowii 

 154. Diameter vegetative cells 34-38/1 209. S.nycttgama 



155. Median wall smooth, outer wall sin- 

 gle, smooth 210, S. grevilleana 



155. Median wall smooth, outer wall double, inner layer scrobic- 



ulate 156 



156. Diameter vegetative cells 20-25/1 235. S.latviensis 

 156. Diameter vegetative cells 30-36/1 240. S.areolata 



157. Median spore wall single, spores 



35-40/1 X 55-64/1 220. S. jritschiana 



157. Median spore wall single, spores 



23-30/1 X 42-56/1 221. 5". goetzei 



157. Median spore wall double, outer 



wrinkled, inner reticulate 223. S. lambertiana 



