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ZYGNEMA 21
43, Spores usually globose, diameter pits
1-2 /A 60. Z. cruciatum
43. Spores cylindric-ovoid, diameter pits
i-2ju. 61. Z. cylindrosporum
44. Diameter pits on median wall
2-6.5 >^ 92. Z. \wangtungense
44. Diameter pits on median wall 4-5 A^ 64. Z. inconspicuum
44. Diameter pits on median wall
7-12 ft 58. Z. transeauianum
45. Receptive gametangia cylindric or slightly enlarged 46
45. Receptive gametangia much enlarged or inflated 49
46. Diameter vegetative cells average less than 27 /x
46. Diameter vegetative cells average more than 27 /x 48
47. Median spore wall with scattered punctations
90. Z. mucigenum
47. Median spore wall smooth 68. Z. chalybeospermum
47. Median spore wall punctate 71. Z. melanosporum
47. Median spore wall scrobiculate and
carinate 72. Z. excompressum
48. Median spore wall smooth 69. Z. cyaneum
48. Median spore wall densely punctate
74. Z. azureum
48. Median spore wall scrobiculate 79. Z. catenatum
48. Median spore wall pitted 77- ^- ornatum
49. Diameter vegetative cells less than 20 /x 50
49. Diameter vegetative cells 20-30/^ 51
49. Diameter vegetative cells more than 30 /x 52
50. Vegetative cells 14-17 ft in diameter 67. Z.atrocoeruleum
50. Vegetative cells 18-24/u, in diameter 70. Z.collinsianum
51. Median spore wall with pits 1-2 /a in
diameter 73- '^- peliosporum
51. Median spore wall with pits 3-4 /^ in
diameter 15- ^' carinthiacum
51. Median spore wall with pits 4-5/^ in
diameter 70. Z. collinsianum
51. Median spore wall with pits 7-11/^ in
diameter 76. Z. pawneanum
52. Pits o£ median wall about 6fi in
diameter 17- ^- ornatum