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115. Diameter vegetative cells 130-150 /x,
about 8 chromatophores, median spore
SPIROGYRA 143
wall verrucose 171. 5. heeriana
116. Diameter vegetative cells 150-
170 /A, 6-7 chromatophores 172. 5. crassiuscula
116. Diameter vegetative cells 170-
200 jn, 6-7 chromatophores i73- '^- tnegaspora
116. Diameter vegetative cells 150-
162 /x, 9-10 chromatophores 174.
iS*. lenticularis
CONJUGATING TUBES FORMED BY THE MALE GAMETANGIA; SHORT
FERTILE CELLS OFTEN ALTERNATING SINGLY, OR IN PAIRS,
WITH LONG STERILE CELLS
117. Diameter vegetative cells less than 30 /^ 118
117, Diameter vegetative cells between 30 jn and 40 /a 125
117. Diameter vegetative cells more than 40 /x 128
118. Zygospores ellipsoid 119
1 18. Zygospores ovoid 124
119. Diameter vegetative cells less than 15 a"- 120
119. Diameter vegetative cells 15/^ to 24/i. 121
119. Diameter vegetative cells more than /j. 24 123
120. Median spore wall smooth 180. 5. liana
120. Median spore wall coarsely punc-
tate 181. S. prescottii
120. Median spore wall reticulate to
punctate 179. 5. taylorii
121. Spores with median wall smooth 122
121. Spores with median wall coarsely
punctate 183. S. collinsii
121. Spores with median wall irregularly
pitted 185. S. sirogonioides
121. Spores with median wall reticulate. . . 186. S. lushanensis
121. Spores with median wall finely scro-
biculate 271. S. sibirica
122. Fertile cells inflated on the con-
jugating side 18. 5. gibberosa
122. Fertile cells inflated both sides.. 182. S.chenii
123. Median spore wall coarsely punctate,
diameter vegetative cells 24-30 a^ 184. S. punctata
123. Median spore wall irregularly retic-
ulate, diameter vegetative cells 27-33/^ 187. S.esthonica