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86 ZYGNEMATACEAE
41. Spore wall scrobiculate 5S. M. paw/ius^ae
41. Spore wall irregularly corrugate 54. M. oedogonioides
42. Diameter vegetative cells 14-18/A. . 53. M.disjtincta
42. Diameter vegetative cells 20-25/i... 59. M.seminoleana
43. Diameter vegetative cells less than 16 /x
43. Diameter vegetative cells 18-21 m, spores
blue, punctate 55- ^- cyanea
43. Diameter vegetative cells 18-21 /tt, spore
wall shallow-scrobiculate, brown 57, M.operculata
44. Spores 28-32 ju. X 12-14 )n, walls
punctate 49. M. depressa
44. Spores 29-38 M X 26-36 /x, walls
coarsely punctate 50. A/, ovalis
44. Spores 32-34 M in diameter, walls
blue, scrobiculate 98. M. cotopaxiensis
45. Spores globose, or 3 lobed filling the sporangium 46
45. Spores variable in position, 30-50 yu. in
length 5. M, calcarea
45. Spores variable in position, cylindric,
60-78 /A 44. M. varians
46. Diameter vegetative cells less than
14/U. 60. M. transeaui
46. Diameter vegetative cells more than 14/". 47
47. Vegetative cells between 14 and 20 /a in
diameter 61. M. fioridana
47. Vegetative cells between 21 and ju. 25 in
diameter 62. M. poinciana
48. All spore walls smooth (inwardly granulose in No, 69) . . 49
48. Spore walls not smooth 61
49. Diameter vegetative cells less than 14 /a 50
49. Diameter vegetative cells more than 14^1 59
50. Spores compressed-globose, diam-
eter vegetative cells 12-13/^1 gg. M. \wangsiensis
50. Spores globose, diameter vegetative
cells 7-9 /A 64. M. cheroI{eana
50. Spores globose, diameter vegetative
cells 4-5/^ 6^. M. caiwani
50. Spores quadrate-ovoid, with or without processes 51
51. Angles of zygospores rounded, undulate, or truncate 52
51. Angles of zygospores retuse, margins concave 55
51. Angles produced, extending into gametangia 56
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