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ZYGNEMA 19
21. Vegetative cell diameter ^y-Tpii 28. Z. majus
21. Vegetative cell diameter 32-38 ju. 29, Z. I^iangsiense
22. Zygospores blue, carinate, and
punctate 35-
•^- carinatum
22. Zygospores yellow to brown 23
23. Diameter vegetative cells 14-20/i 24
23. Diameter vegetative cells 20^1 or more 25
24. Spores 15-25/^ X 25-35 /x, all walls
smooth 30. Z. raljsii
24. Spores 28-32 /J. X 36-40//., median
wall punctate 3i- -^- micropunctatum
25. Median spore wall smooth, brown 32. Z, momoniense
25. Median spore wall pitted, yellow-brown 33. Z. circumcarinatum
25. Median spore wall double, outer layer
smooth, inner verrucose 34- -^^ pawhus\ae
SPORES IN THE GAMETANGIA
26. Median spore wall colorless, yellow, or brown 27
26. Median spore wall blue 45
27. Diameter vegetative cells less than 20 /t 28
27. Diameter vegetative cells 20-30 /i 29
27. Diameter vegetative cells more than 30 /a 40
28. Vegetative cell diameter 9-12/^,
spore wall punctate 36- Z. stagnale
28. Vegetative cell diameter 14-20 m,
spore wall punctate 37-
28. Vegetative cell diameter 15-18 /a,
-2^- subtile
spore wall punctate 38- ^- cylindrospermum
28. Vegetative cell diameter 16-18 ju-,
spore wall with pits 3-4.5 f. 39- ^- yunnanense
29. Median spore wall smooth 30
29. Median spore wall punctate to scrobiculate 31
29. Median spore wall verrucose 39
30. Diameter vegetative cells 20-24 /x.. 43. Z.leiospermum
30. Diameter vegetative cells 26-30 ju,.. 55. Z.insigne
31. Pits 2/x or less in diameter 32
31. Pits more than 2 /a in diameter 33
32. Diameter vegetative cells 22-29^,
pits widely spaced 46. Z. luteosporum
32. Diameter vegetative cells 23-26 /x,
pits closely spaced 48. Z. calosporum