1 8 ZYGNEMATACEAE 



II. Spores usually more than 40/1 in diam- 

 eter 7. Z. sl{ujae 



12. Spores 24-33 M, scrobiculate, diam- 

 eter pits less than 2/i 6. Z. conspicuum 



12. Spores 33-40/1, scrobiculate, diam- 

 eter pits 3-4 M ^f. Z. latvtonianum 



12. Spores 38-42/1, punctate and ridged 10. Z.chungii 

 12. Spores 36-45/1, scrobiculate, diam- 

 eter pits 2/1 13- ■2- adpectinattim 



13. Diameter median spore wall pits 5-8/1. u. Z.sinense 

 13. Diameter median spore wall pits 4/t. . . 12. Z. globosum 

 14. Outer layer wrinkled, inner verru- 



cose 9. Z. verrucosum 



14. Outer layer scrobiculate, inner ver- 



rucose 16. Z. laetevirens 



14. Outer layer pitted, inner verrucose. 15. Z.areolatum 

 15. Median spore wall single, pits 2-3/1- in 



diameter 17. Z. pectinatum 



15. Median spore wall single, pits 3-4 /•• in 



diameter 18. Z. excrassum 



15. Median spore wall double, outer ver- 

 rucose 9. Z. verrucosum 



16. With median spore wall single. ... 19. Z. neopectinatum 

 16. With median spore wall double. . . 20. Z. giganteum 

 17. Diameter vegetative cells 16/1 or less. . 21. Z. gedeanum 



17. Diameter vegetative cells 17-27/1. 18 



17. Diameter vegetative cells more than 27/1 21 



18. Median wall smooth 19 



18. Median wall not smooth 20 



19. Median spore wall dark blue, diameter 



34-40/1 22. Z. cyanosporum 



19. Median spore wall light blue, diam- 

 eter 30-40 /x '^i- ^- czurdae 



20. Diameter vegetative cells 16-18/1., 



spores compressed 35- •^- carina turn 



20. Diameter vegetative cells 17-24/1.. 24. Z.synadelphum 

 20. Diameter vegetative cells 24-26/1, 



diameter spore 32-35/1 26. Z. coeruleum 



20, Diameter vegetative cells 23-27/1., 



diameter spore 36-42/1 27. Z. goral{hporense 



20. Diameter vegetative cells 18-24/1, 



forming mats on soil 25. Z. terrestre 



