MOUGEOTIA 89 



74. Spore wall smooth 75 



74. Spore wall punctate 76 



75. Diameter vegetative cells 8-12 /a, spores 



gray-brown 95. M. rava 



75. Diameter vegetative cells 8-14 p., spores 



colorless 5. M. calcarea 



75. Diameter vegetative cells 5-9 /a, spores 



yellow 92. M. ventricosa 



76. Vegetative cells 8-12 jtt in diameter 77 



76. Vegetative cells 13-15 /x in diameter 94. M.mayori 



77. Sporangia asymmetric-ellipsoid 93. M.prona 



77. Sporangia globose 24. M. caelestis 



78. Diameter vegetative cells 14-19JU... 51. M.pectosa 



78. Diameter vegetative cells 19-24/"-. . 14. M.sphaerocarpa 



Aplanospores have been observed in scattered cells, or entire fila- 

 ments of the following species that regularly reproduce by zygospores : 

 M. ajricana, M. americana, M. areolata, M. caelestis, M. calcarea, M. 

 capucina, M. cyanea, M. elegantula, M. floridana, M. gracillima, M. 

 laetevirens, M. nummuloides, M. parvula, M. pectosa, M. poinciana, 

 M. producta, M. quadrangulata, M. recurva, M. seminoleana, M. 

 sphaerocarpa, M. thylespora, M. transeaui, M. tumidula, M. ubero- 

 sperma, M. viridis. 



Descriptions of Species 



1. MouGEOTiA ANGusTA (Hassall) Kirchner 1878. Kryptogamen- 



fiora Schlesien, p. 128. 



Vegetative cells 5-6;". x 30-95 /a; chromatophores with 4 pyrenoids 

 in a row; conjugation scalariform; zygospores formed wholly in the 

 conjugating tube, globose, about 7-8 /a in diameter; spore wall brown, 

 smooth. (PL XIII, Fig. i.) 



United States: South Carolina. 



British Isles; Germany; Austria; Belgium; Bulgaria; Czechoslovakia; 

 North Africa; Netherland Indies. 



2. MouGEOTiA TENUissiMA (dc Bary) Czurda 1932. Siisswasser- 



flora Mitteleuropa. 9, p. 66. 



Vegetative cells 5-6 ju. in diameter; conjugation scalariform; zygo- 

 spores formed wholly in the conjugating tube, ovoid, 11-15M x 12-14 ja; 

 spore wall brown, thick, smooth. (PI. XIII, Fig. 2.) 



Germany; France. 



3. MouGEOTiA PARVULA Hassall 1843. Ann. and Mag. Nat. Hist. 



11, p. 434. 



