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84
ZYGNEMATACEAE
17. Diameter vegetative cells 24-40/i 18
17. Diameter vegetative cells more than 40 /a 21
18. Spores 30-48/1 in diameter 19
18. Spores /i. 47-52 in diameter id. M. jogensis
18. Spores 55-70/1 in diameter 21. M. macrospora
19. Spores about 30-40/1 in diameter 20
19. Spores ovoid about 40/1 x 50-59/1 18. M. ovalispora
19. Spores about 40-50/1 in diameter 19. M. hirnii
19. Spores about 45-55 M in diameter 17. M.ajricana
20. Conjugation usually lateral 20. M. genuflexa
20. Conjugation usually scalariform .. 15. M.scalaris
21. Spores about 50/1 in diameter 22. M.subcrassa
21. Spores about 65/1 in diameter 23. M. crassa
22. Diameter vegetative cells less than 16/1 23
22. Diameter vegetative cells more than 16/1 24
23. Spores ovoid, 18-20/1 x 21-25/1, light
yellow, punctate 24. A/, caelestis
23. Spores compressed-ovoid, rarely sub-
globose (about 30-36/1) 50. M. ovalis
23. Spores globose to ovoid, brown (about
22-32/1) 25. M. nummiiloides
24. Chromatophores with pyrenoids in a single row 25
24. Chromatophores with pyrenoids scattered 30
25. Spores globose or subglobose 26
25. Spores ovoid to ellipsoid 29
26. Diameter of spores usually less than 32/1 (in No. 28,
28-35/^) ; 27
26. Diameter of spores 32/1 or more (in No. 28, 28-35/1) 28
27. Spore wall reticulate 26. M. sinensis
27. Spore wall coarsely punctate 29. A/, micropora
27. Spore wall punctate 28. M. ornata
28. Diameter spores 32-38/1 36. A/, globulispora
28. Diameter spores 40-50/1 27. A/, megaspora
29. Spore length 28-45/1, wall verrucose,
outer wall thick 34- ^- lamellosa
29. Spore length 40-50/1, wall verrucose,
outer wall thin 35- ^- fnicro verrucosa
29. Spore length 40-50/1, wall punctate... 37. M.pulchella
29. Spore length 35-50/1, wall scrobiculate 38. M.laevis
29. Spore length 50-70/1, wall areolate. . . . 30. M.areolata
30. Spores globose to subglobose 31