74 



ZYGNEMATACEAE 



among the Zygnemataceae. Skuja's figures are the only ones that 

 accurately represent cither the vegetative or the reproductive 

 structures. 



Description of Species 



MouGEOTioPsis cALospoRA Palla 1894. Berichte deutsch. hot. 

 Gesells. 12, p. 228. Skuja. Acta Horti Bot. Vnw. Lat- 

 viensis. 1, p. 45, PI. 2, Figs. 19-26. 1929. 



Vegetative cells cylindric, io-18/x x lo-yoju. with plane end walls; 

 I axial chromatophore with the nucleus beside it in the center of the 

 cell; fertile cells similar or somewhat longer; conjugation scalariform; 

 zygospores often irregularly placed and irregularly ovoid to quadrate- 

 ovoid 16-2 v^ X 21-38 iu.; outer wall thin, transparent; median wall 

 thick, deeply and sharply scrobiculate; pits 1.5-2.5 m in diameter, light 

 yellow to brown in color. (PI. XII, Figs. 16-17.) 



United States: Wisconsin (Prescott Coll.); Michigan, Douglas Lake 

 (Ackley Coll.). 



Southern Bavaria; Austria; Czechoslovakia; Latvia. 



In the American specimens I found conjugation occurring between 

 filaments of all the various diameters so that it seems inadvisable to separate 

 the smaller and larger forms as has been suggested by some authors. 



