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 44 



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 25 ju. 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 



