138 



ZYGNEMATACEAE 



8i 



8i 



117. S.c/iung/^ingensis 



115. 



S. 



miamiana 



SPORES NOT LATERALLY COMPRESSED 

 MEDIAN WALL NOT SMOOTH 



75. Diameter vegetative cells between 16 /x and 25 m 76 



75. Diameter vegetative cells mostly between 25^ and 35 /u. 77 



75. Diameter vegetative cells between 35^1 and 60 i^ 84 



75. Diameter vegetative cells between 60 /x and 125 /li 96 



76. Spores ellipsoid, chromatophores 



3, diameter vegetative cells 22- 



26/x 



76. Spores ovoid, chromatophores 2- 



1, diameter vegetative cells 16- 

 22 /i 108. S. puncticulata 



76. Spores ellipsoid, chromatophores 



3-2, diameter vegetative cells 20- 



25^1 



76. Spores ovoid, chromatophores 3- 



2, diameter vegetative cells 23- 



25 M 109. S. aeqtiinoctialis 



77. Zygospores ovoid 78 



77. Zygospores ellipsoid 79 



78. Chromatophores 2, diameter veg- 

 etative cells 25-32 jtt no. 5. rhizopus 



78. Chromatophores 3-2, diameter 



vegetative cells 28-32 /^ in. 5. dictyospora 



78, Chromatophores 2-4, diameter 

 vegetative cells 30-37 /a, median 

 spore wall double 135 



78. Chromatophores 1-3, diameter 

 vegetative cells 31-36 /a 112 



78. Chromatophores 3-4, diameter 



vegetative cells 30-45 /a i33- "^^ fiuviatilis 



79. Diameter spores usually less than 32 /x, 



2 chromatophores 1 13. 5. fossa 



79. Diameter spores between 32 and 43^1 



79. Diameter spores usually more than 43 /u. 81 



80. Median spore wall punctate or scrobiculate 82 



80. Median spore wall reticulate 83 



Chromatophores 2-3 (-4), diameter 



spores 43-46 /x 1 14. 5. schmidtii 



Chromatophores 3-4, diameter spores 



45-52 M i\G. S. smithii 



S. notabilis 

 S. natchita 



80 



