92 ZYGNEMATACEAE 



10. MouGEOTiA DROUETii Transcau 1938. Amer. Jour. Bot. 25, 



p. 524, Fig. I. 



Vegetative cells 14-18 ju. x 72-1 80 m, with 4 to 8 pyrenoids in a single 

 row; conjugation scalariform; zygospores globose in the enormously 

 enlarged tube and extending into the gametangia, 32-37 /a x 33-42 /x; 

 spore wall smooth, yellow-brown, obscured by the granular mem- 

 branous residue left after conjugation. (PI. I, Fig. 10.) 



South America, Brazil, state of Ceara, Fortaleza (Drouet Coll.). 



11. MouGEOTiA KERGUELENSis Kricgcf 1941. Rabeuhorst's Krypt- 



ogamenflora. 13 (2), p. 134. 



Vegetative cells about i2ai x 48-96^; chromatophore with several 

 pyrenoids in a single row; conjugation scalariform; zygospores in the 

 conjugating tubes, sometimes extending slightly into the gametangia, 

 about 27 /x in diameter; spore wall smooth, dark blue. (PI. XIV, Fig. i.) 



Kerguelen Islands, South Indian Ocean (Werth Coll.). 



12. MouGEOTiA MALTAE Skuja 1 926. Acta Horti Bot. Univ. Lat- 



viensis. 1, p. 109, Fig. i. 



Vegetative cells 17-22/Li x 60-1 20 (-200) i^; chromatophore nearly 

 as long as the cell, with 4-8 pyrenoids in a single row; conjugation 

 scalariform; zygospores formed wholly in the conjugating tube, glo- 

 bose ( ^50-) 32-35 (-40) u in diameter; spore wall blue, smooth, sur- 

 rounded by a gelatinous layer 4-6^1 in diameter. (PI. XIV, Fig. 2.) 



Latvia, Usma Lake. 



13. MouGEOTiA REiNscHii Tfanseau 1934. Trans. Amer. Micros. 



Sac. 53, p. 224. 



Vegetative cells 15-24^1. in diameter; chromatophore with 4-8 pyre- 

 noids in a single row; conjugation lateral, very rarely scalariform; 

 zygospores quadrately ovoid, 24-30 /a x 26-32 m; spore wall brown, 

 smooth. (PI. XIV, Fig. 3.) 



United States: Illinois; Ohio. 



Germany; Poland; Czechoslovakia; lava. 



In a collection from Fayettevillc, Ohio, May 8, 1934, several spores 

 resulting from scalariform conjugation were found among the hundreds 

 resulting from lateral conjugation. Formerly classified as Mougeotia gracilis 

 (Reinsch) Czurda. 



14. Mougeotia sphaerocarpa Wolle 1887. Freshwater Algae of 



the United States, p. 227, PI. 146, Figs. 1-2. 

 Vegetative cells 19-24/i x 60-1 20 (-240) m; chromatophore platelike, 

 with 4-16 pyrenoids in an irregular row; conjugation scalariform; 

 zygospores formed in the greatly enlarged conjugating tubes and ex- 



