SPIROGYRA 147 



157. Median spore wall double, outer 



wrinkled, inner smooth 262. S. jaoi 



158. Diameter vegetative cells 18-23 /x, 



i8-24iU. times as long 218. S. groenlandica 



158. Diameter vegetative cells 24-30 /a, 



3-10 times as long 219. S. quadrata 



REPLICATE END WALLS 

 TUBES FORMED BY MALE GAMETANGIA 



159. Median spore wall smooth 162 



159. Median spore wall not smooth 160 



160. Zygospores mostly ellipsoid 161 



160. Zygospores mostly ovoid, median 



wall areolate 225. S. laxistrata 



161. Median spore wall single, foveolate. . 214. S.foveolata 

 161, Median spore wall double, wrinkled 



and reticulate 223, S. lambertiana 



162. Fertile cells fusiform-inflated both sides 163 



162. Fertile cells cylindrically inflated 165 



162, Fertile cells inflated mostly on the conjugating side 166 



163. Diameter vegetative cells 16-19 /x 203, S. pseudospreeiana 



163. Diameter vegetative cells 18-25/1 164 



163. Diameter vegetative cells 28-39/1 211. S. chuniae 



164. Zygospores 24-28 /a x 46-52/1. . . . 227. S.tsingtaoensis 

 164. Zygospores 30-36/1 x 55-100/1... 226. S.spreeiana 



165. Diameter vegetative cells 13-16/1 202. S. cylindrica 



165. Diameter vegetative cells 18-21 /i 204. S. pascheriana 



166. Vegetative cell diameter 17-25/1, 



spores ellipsoid 230. S. croasdaleae 



166. Vegetative cell diameter 21-25/1, 



spores ovoid 210. S. grevilleana 



166. Vegetative cell diameter 26-29/1, 



spores ellipsoid 205. S. hopeiensis 



REPLICATE END WALLS 

 USUALLY TWO OR MORE CHROMATOPHORES 



167. Median spore wall outwardly smooth (punctate in No. 212) 168 



167. Median spore wall not smooth (yellow to dark brown) .... 177 



168. Fertile cells cylindric or enlarged, all spore walls smooth 169 



168. Fertile cells inflated 172 



