no ZYGNEMATACEAE 



Differs from A/, punctata in having zygosporangia with convex lateral 

 walls and smaller dimensions. 



8i. MoucEOTiA AUSTRiACA Czurda 1932. Siisstvasserflora Mittel- 

 europa. 9, p. 90, Fig. 82. 



Vegetative cells 7-9 /^ x 50-140 jt^; chromatophores with 2 pyrenoids; 

 conjugation scalariform ; zygospores quadrangular, with concave sides 

 and rounded corners bulging into the gametangia, 20-25^ x 27-30/i; 

 spore wall golden-brown, thick, scrobiculate; pits about 1/^ in diam- 

 eter. (PI. XIX, Figs. 11-12.) 



United States: Texas (Taft Coll.). 



Austria, Wiener-Neustadt. 



82. MouGEOTiA viRESCENs (Hassall) Borge 19 13. Siisswasserfiora 



Deutschland. 9, p. 43. 



Vegetative cells 8-9^^1 x 50-220/'.; conjugation scalariform; sporan- 

 gia dividing both gametangia; zygospores quadrangular, with concave 

 sides, 29-35 ju, X 29-35 ,a; ^^^^ colorless, smooth, with rounded corners. 

 (PI. XIX, Fig. 16.) 



United States: Wisconsin (Prescott Coll.). 



Canada, Maritime Provinces (Hughes Coll.); England; Germany; 

 France to Yugoslavia; China, Yunnan (Li Coll.), and Szechwan (JaoColl.). 



83. MouGEOTiA ROTUNDANGULATA Jao 1935. Sittcnsia. 6, p. 579, 



PI. 2, Figs. 45-46. 



Vegetative cells 8-10 /a x i 60-420 m; chromatophores with 8-14 

 pyrenoids in a single row; conjugation scalariform; sporangia dividing 

 both gametangia; zygospores quadrangular, somewhat tumid, 32-35 m x 

 32-35 /J., with rounded angles; wall scrobiculate with scattered pits, 

 1-2/X in diameter, colorless at maturity. (PI. XIX, Figs. 13-14.) 



China, Szechwan. 



84. MouGEOTiA PUNCTATA Wittfock 1 867. Algologiska St tidier. I. 



Uppsala. 



Vegetative cells 8-10 /a x 50-120^1; chromatophores with 4 pyre- 

 noids in a row; conjugation scalariform; sporangia dividing both gam- 

 etangia; zygospores quadrangular with concave sides and obtuse or 

 retuse angles, 30-38 /x x 30-3S/M, 18-20 /a thick; outer wall finely scrobic- 

 ulate, inner nearly smooth. (PI. XIX, Fig. 15.) 



United States: Wisconsin (Prescott Coll.); Florida (Tiffany Coll.). 



Sweden, Upland; Brazil (Drouet Coll.). 



Jao has recently described (Bot. Bull. Acad. Sinica. I, p. loi, 1947) a 

 new species, M. subpunctata, that closely resembles this species, but the cell 

 diameters are 5-6.5/1 and the spores are 20-25 /xx 18-25/1. 



