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SPIROGYRA 131
II. Most of the spores less than 28 /a in thickness 12
II. Most of the spores more than 28 ju, in thickness 13
12. Diameter vegetative cells 11-
14.5/1, sterile cells inflated or
bullate 50. 5. porangabae
12. Diameter vegetative cells 19-22 /x,
sterile cells bullate 21. S. bullata
12. Diameter vegetative cells 18-26 /i. i. S. communis
12. Diameter vegetative cells 25-29 /a 2. S.intorta
13. Diameter vegetative cells 24-30/1, diameter
zygospores 28-3310. 3- ^^^ juergensii
13. Diameter vegetative cells 29-39 /a, diameter
zygospores 27-36/1 4. .S. singularis
13. Diameter vegetative cells 32-40 /a, diameter
zygospores 36-43 /a 5.5. silvicola
14. Vegetative cells less than 30/1 in diameter 15
14. Vegetative cells 30-40 /x in diameter 17
14. Vegetative cells more than 40/1 in diameter 18
15. Diameter vegetative cells 19-21 /a 18. S. gibberosa
15. Diameter vegetative cells 16-24/1 8. 5. gracilis
15. Diameter vegetative cells 23-30 /j. 16
16. Fertile cells only slightly inflated 9. S. jragilis
16. Fertile cells strongly inflated 10, S.teodoresci
17. Median spore wall smooth, outer scro-
biculate 11. S. pseudovarians
17. Median spore wall smooth, outer
smooth 12, S. varians
17. Median spore wall smooth, with dark
brown polar caps 13- '5'. bicalyptrata
18. Diameter vegetative cells 40-50 /a,
diameter spores 40-50 /t 14. 5. circumlineata
18. Diameter vegetative cells 50-57 /a,
diameter spores 35-40 /a 15, 5. supervarians
19. Vegetative cells less than 24/1 in diameter 20
19. Vegetative cells more than 24 /a in diameter 21
20. Chromatophore i, diameter veg-
etative cells 15-19/1, spore length
/A 45-55 16. 5. fennica
20, Chromatophore 1-2, diameter
vegetative cells 17-20/1, sterile
cells bullate 22. S. pratensis