282 ZYGNEMATACEAE 



PLATE XIX 



MOUGEOTIA 



Figs. 1-2. — A/, grciril/inui, aplanospore and zygospore from Oneida 

 Lake, New York. Figs. 3-4. — M. viridis, aplanospore and zygospore from 

 Saugatuck, Michigan. Figs. 5-6. — M. producta, aplanospore and zygospore 

 from Burma. After West. Figs. 7-8. — M. rcgellii, zygospores, face and 

 lateral views from Greece. After Skuja. Figs. 9-10. — M. tumidula, zygo- 

 spore, aplanospore, and vegetative cell from Illinois. Figs. 11-12. — A/, aus- 

 tr'iaca, two zygospores from Wiener-Neustadt, Austria. After Czurda. 

 Figs. 13-14. — M. rotundangulata, zygospore and details of spore wall from 

 Szechwan, China. After Jao. Fig. 15. — A/, punctata, zygospore from 

 Sweden. After Wittrock. Fig. 16. — M. virescens, zygospore from England. 

 After Hassall. Figs. 17-18. — M. paludosa, two zygospores from England. 

 After West. Figs. 19-20. — M. quadrangulata, aplanospore and zygospore 

 from Illinois. Fig. 21. — M. tropica, aplanospore (in optical section) and a 

 vegetative cell from Angola, Africa. After West. Figs. 22-23. — ^- '"'^""'- 

 ana, two forms of aplanospores from the same filament, from Miami, Okla- 

 homa. Fig. 24. — M. ventricosa, aplanospores from Sweden. After Wittrock. 

 Fig. 25. — M. rava, aplanospores variously placed in the sporogenous cell, 

 from Starkville, Mississippi. Figs. 26-28. — M. prona, vegetative cell, early 

 stage of aplanospore formation, and mature aplanospores from High Hill, 

 Long Island, New York. Fig. 29. — M. mayori, an aplanospore from Colom- 

 bia, South America. After West. Figs. 30-31. — M. tenerrima, vegetative 

 cell and aplanospore from Colombia, South America. Alter West. Fig. 32. — 

 M. suhpahidosa, zygospore from Kwangtung, China. After Ley. 



