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SPIROGYRA 145
133. Reproducing by aplanospores 198. S. narcissiana
133. Reproducing by zygospores 199. S. undulisepta
DIVISION WALL REPLICATE
134. A circular infold on the end walls of most cells 135
135. Tubes formed by both gametangia 136
135. Tubes apparently formed by the male gametangia 159
136. With I chromatophore in each cell, rarely 2 in some cells 137
136. With usually more than i chromatophore in each cell. 167
REPLICATE END WALLS
USUALLY ONE CHROMATOPHORE
137. Fertile cells cylindric or enlarged 138
137. Fertile cells fusiform-inflated 148
137. Fertile cells cylindrically ("quadrately") inflated 158
138. Zygospores ellipsoid 139
138. Zygospores ovoid 143
139. Median spore wall smooth, and outer wall smooth 140
139. Median spore wall smooth, but inner
layer of outer wall scrobiculate 236. S. venusta
139. Median spore wall reticulate 222. S. dentireticulata
140. Diameter vegetative cells less than 24 i^, 141
140. Diameter vegetative cells between 24 /x and 40 /^ 142
140. Diameter vegetative cells more
than 40 /A 233. S. tjibodensis
141. Zygospores 22-26 (-32) ;u, x 51-103 /a.. 228. S.arta
141. Zygospores 30-36 /a x 55-1 10 /a, some
fertile cells inflated 226. S. spreeiana
141. Zygospores 25-35^1 x 48-86 ju, sterile
cells inflated 229. S. tumida
142. Zygospores 32-42/1 x 80-122 /a,
outer wall thick, lamellate 231. 5". lamellosa
142. Zygospores 30-33/1 x 60-82/1,
outer wall thin 232, S. laxa
142. Zygospores 35-46/1 x 61-106/1,
usually ovoid 208. S. semiornata
143. Median spore wall smooth, outer also smooth 144
143. Median spore wall smooth, outer wall of 2 layers, of which
the inner is transparent, scrobiculate 145
143. Median spore wall granulate, outer
wall of 2 thin layers 224. S. microgranulata