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 47-52 /i. 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 



