132 ZYGNEMATACEAE 



20. Chromatophore i, diameter veg- 

 etative cells 20-24 M, spore length 



48-60 /A 17. 5. part' Ilia 



20. Chromatophore i, diameter veg- 

 etative cells 20-25^1, spore length 



52-72^1 26S. 5. macrospora 



21. Fertile cells short, globose, spores 



28-33/x X 30-50/1 2:5. 5. affinis 



21. Fertile cells longer, fusiform-inflated 22 



22. Spore diameter 20-30 m, yellow- 

 brown 27. 5. subsalsa 



22. Spore diameter 22-29 /x, yellow. . 9. S.jragilis 



22. Spore diameter 27-33 ju, yellow.. 24. S.catetiaefonnis 



22. Spore diameter 28-38 jn, brown. . 25. S.subsalina 



23. Diameter vegetative cells 30-^5 /t 19. 5. borgeana 



23. Diameter vegetative cells 37-42 /a 20. 5. calcarea 



ONE CHROMATOPHORE 

 SPORES USUALLY OVOID, MEDIAN WALL SMOOTH 



24. Vegetative cells usually less than 40 /a in diameter 25 



24. Vegetative cells usually more than 40/1 in diameter. ... 31 

 25. Diameter vegetative cells less than 15 /a 26. S.fiavescens 



25. Diameter vegetative cells more than 15 /a 26 



26. Spore diameter usually less than 30 /a 27 



26. Spore diameter usually more than 30/1 28 



27. Spores ovoid, diameter 18-20 /a 27. S. subsalsa 



27. Spores ovoid, diameter about 24/A. . . . 28. S. paludosa 

 27. Spores ovoid-ellipsoid, diameter 24- 



29/A (usually aplanospores) 29. 5. mirabilis 



28. Fertile cells cylindric or enlarged 29 



28, Fertile cells inflated on one or on both sides 30 



29. Diameter zygospores 28-38 /a, yellow. 30. S.longata 

 29. Diameter zygospores 33-38/1, brown. 269. S.indica 

 29. Diameter zygospores 36-43/1, yellow- 

 brown 5. 5. silvicola 



29. Diameter zygospores 37-57 M, outer 



wall of 2 layers 40. 5. uelata 



30. Fertile cells inflated on both sides 32. S.siiecica 

 30. Fertile cells slightly inflated, sec- 

 ond outer wall scrobiculate 40. iS'. velata 



30. Fertile cells inflated on the inner 



side \2. S. vartans 



