ZYGNEMOPSIS 51 



6. Median spore wall punctate, yel- 

 low-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, yel- 

 low 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, yellow- 

 brown, 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 36 ju. 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 



3 jLt 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 



