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ZYGNEMOPSIS 51
6. Median spore wall punctate, yellow-brown
6. Z. desmidioides
6. Median spore wall punctate, chest-
nut brown 7. Z. columbiana
6. Median spore wall punctate, yellow 9. Z. tiffaniana
6. Median spore wall scrobiculate, yellow
10. Z. sinensis
6. Median spore wall finely scrobic-
ulate, yellow-brown 8. Z. americana
7. Median spore wall scrobiculate, yellow,
pits 2-3 II 10. Z. sinensis
7. Median spore wall scrobiculate, yellowbrown,
granulose 12. Z. splendens
8. Median spore wall punctate, or
undulate, granulose 15. Z. iyengarii
8. Median spore wall punctate, choc-
olate brown 17. Z. sphaerospora
8. Median spore wall scrobiculate 9
9. Zygospores 32-36/^ x 36-42 /x, golden
yellow, suture 14. Z. stephensiae
9. Zygospores with shorter axis more than ju. 36 10
10. Median spore wall smooth or undu-
late, yellow-brown, granulose 11. Z. indica
10. Median spore wall deeply scrobic-
ulate, pits 2-4 /i angular i3- 2^- wiichangensis
10. Median spore wall scrobiculate, pits
jLt
3 round 16. Z. quadrata
II. Zygospores 36-52 /x, brown to green... 18. Z.lamellata
1 1 . Zygospores 24-30 [i- x 30-48 [i, brown ... 20. Z. decussata
II. Zygospores 28-36 ft x 48-60 m, brown. . . 21. Z. spiralis
12. Vegetative cell diameter 8 /a or less 3, Z. gracilis
12. Vegetative cell diameter 14-22 /x 13
12. Vegetative cell diameter 30-50JU. 14
13. Spores spindle-shaped, median wall
scrobiculate 19. Z. transeauiana
13. Spores ovoid, truncate, median wall
scrobiculate 20. Z. decussata
13. Spores compressed-ovoid, tricarinate. . 22. Z.jertilis
14. Spores elHpsoid to ovoid, diameter
40-55 /A 24. Z. hodgettsii
14. Spores ellipsoid to ovoid, diameter
70-94 /i 23. Z. pectinata