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20 ZYGNEMATACEAE
32. Diameter vegetative cells 24-30 /a,
pits 2 diameters apart 5i-
^- subcrticiatum
33. Median wall pits 2-4/' in diameter 34
33. Median wall pits more than 4 /a in diameter 36
34. Receptive gametangia nearly cylin-
dric 49. Z. vaucherii
34. Receptive gametangia greatly enlarged
45- '^- substellinum
34. Receptive gametangia enlarged on conjugating side 35
35. Diameter vegetative cells 18-24/A 42. Z.tenue
35. Diameter vegetative cells 24-28 /a 50. Z. normani
35. Diameter vegetative cells 28-38 /a 59- '^- stellinum
36. Vegetative cells less than 24 /j. in diameter 37
36. Vegetative cells more than 24 /a in diameter 38
37. Diameter median wall pits 4.5-6/^..... 40. Z.extenue
37. Diameter median wall pits 7-9 /^ 44. Z. hausmannii
38. Receptive gametangia inflated in-
ner side 51. Z. insignisporum
38. Receptive gametangia globosely in-
flated 54. Z. germanicum
38. Receptive gametangia nearly cylin-
dric 56. Z. janicum
38. Receptive gametangia enlarged ... 57. Z. subfanicum
39. Median spore wall verrucose 52. Z. vaginatum
39. Median spore wall with raised prominences
41. Z. tholosporum
39. Median spore wall double, inner layer
verrucose 47-
-^^ flavum
40. Diameter vegetative cells 30-40;^ 41
40. Diameter vegetative cells 40-50 /a. . 65. Z.neocruciatum
40. Diameter vegetative cells 50-60 ju.. . 66. Z.crassitisculum
41. Median spore wall scrobiculate or pitted 42
41. Median spore wall verrucose and wavy 62. Z.bohemicum
41. Median spore wall of 2 layers, inner
reticulate -verrucose, outer thick,
smooth 6t,. Z. mirandum
42. Median wall with pits less than 4/^ in diameter 43
42. Median wall with pits more than 4/x in diameter 44
43. Spores usually globose, diameter pits
3-4M 59. Z. stellinum