100 ZYGNEMATACEAE 



United States: Wisconsin (Prescott Coll.). 

 Sweden; Finland; Holland; Czechoslovakia. 



45. MouGEOTiA ANGOLENSis W. & G. S. Wcst 1 897. Jour. Bot. 35, 



P-39- 



Vegetative cells 25-29 /x x 100-145 /x; chromatophores with 4-6 very 

 small pyrenoids irregularly disposed; conjugation scalariform; zygo- 

 spores in the conjugating tubes, short-cylindric with concave sides, 

 19-21 /x in diameter; wall smooth; gametangia slightly curved. (PI. 

 XVI, Fig. 16.) 



Africa, Angola. 



West's drawing of the spore may be misleading. The polar ends should 

 be visualized as circular. 



46. MouGEOTiA LAETEviRENS (Braun) Wittrock 1877. Wittrock 



and Nordstedt Algae Exsiccatae, No. 58. Bot. Notiser 

 1877. p. 23. 



Vegetative cells 35-40 /x x 65-350^1; chromatophores with numerous 

 scattered pyrenoids; conjugating cells geniculate; conjugation scalar- 

 iform; zygospores in the conjugating tubes; outer wall short-cylindric, 

 36-47 /Li X 45-72;"., with concave sides; spore wall yellow-brown, smooth; 

 aplanospores ovoid or obliquely ovoid. Spores quite variable in form. 

 (Pl.XVI, Figs.9-11.) 



United States: Wisconsin and Indiana; eastward to Massachusetts and 

 Florida. 



Europe; South America; southern Siberia; India; China; Australia. 



47. MouGEOTiA ACADiANA Transeau 1934. Trans. Amer. Micros. 



Soc. 53, p. 224. 



Vegetative cells 43-54/^ x 100-400 ^u,; chromatophores with many 

 scattered pyrenoids; conjugating cells geniculate; conjugation scalar- 

 iform; zygospores in the greatly enlarged conjugating tubes, cylindric- 

 ovoid, usually with concave sides, ends convex, 51-70 /x x 57-78 m; spore 

 wall yellow, thick, smooth. Similar to M. laetevirens but larger in all 

 dimensions. 



United States: Mississippi and Florida. 



Latvia (Skuja); Czechoslovakia (Czurda). 



Some of the records for M. laetevirens probably belong to this larger 

 species which it closely resembles. 



48. MouGEOTiA oPELOusENSis Taft 1 944. OIlio Jour. Set. 44, p. 238. 



Vegetative cells 25-28 /x x 1 50-340 /x; chromatophores with 6-12 

 pyrenoids in a single row; conjugation scalariform; zygospores short- 



