Mougeotia quadrangulata Hassall 1843, p. 434 

 PI. 71, Figs. 3-5 

 Vegetative cells long-cylindric, 14-16;li in diameter, 135-150/i, long; 

 chloroplast a broad plate extending the full length of the cell, with 

 4_6 pyrenoids. Zygospores formed in the tube, dividing both 

 gametangia; quadrate, with straight or slightly retuse margins, ovate 

 when seen from the side; wall finely scrobiculate or punctate, 

 colorless; 28-40jU in diameter. 



In shallow water of lake margins and swamps. Mich., Wis. 



Mougeotia recurva ( Hass. ) DeToni 1889, p. 714 



Vegetative cells 12-18/x in diameter, 50-180;a long. Zygospores 

 formed in the tube, not dividing the gametangia; globose; median 

 spore wall brown and smooth; 23-33/x in diameter. 



Mich. 



Mougeotia Reinschii Transeau in 



Transeau, Tiffany, Taft, & Li 1934, p. 224 

 Vegetative cells 9-13/x in diameter, 80-160/^ long; chloroplast with 

 5-8 pyrenoids in a single series. Zygospores usually formed by 

 lateral conjugation, or in the tube by scalariform conjugation, not 

 dividing the gametangia; quadrangular-globose or rhomboid; me- 

 dian spore wall yellow and smooth; 25-30)U, in diameter. 

 Mich. 



Mougeotia robusta ( DeBary ) Wittrock in 



Wittrock & Nordstedt 1884, Algae Exsic. No. 651 



PI. 74, Fig. 7 



Vegetative cells 25-33/^ in diameter, 75-260/1 long; chloroplast 



with many irregularly placed pyrenoids. Zygospores formed in the 



tube, not dividing the gametangia; ovate to subglobose; median 



spore wall brown and scrobiculate; 35-41^ in diameter, 47-54/a long. 



Mich. 



Mougeotia robusta var. hiornata Wittrock in 



Wittrock & Nordstedt 1884, Algae Exsic. No. 615 



Vegetative cells 27-30/^ in diameter, 25-240/a long. Zygospores 

 with outer wall inwardly verrucose, median spore wall scrobiculate; 

 30-38/x in diameter, 42-50/x long. 



Mich. 



Mougeotia scalaris Hassall 1842, p. 45 



PI. 71, Figs. 6, 7 

 Vegetative cells 20-27-(34)jLt in diameter, 40-180/x long; chloro- 

 plast a broad plate with 4 pyrenoids. Zygospores formed in the tube 



[304] 



