296 ZYGNEMATACEAE 



PLATE XX\'I 



Spirocyka 



Figs. 1-2. — S. maiavillosa, vegetative cell and aplanospores from north- 

 ern Brazil. Fic. 3. — S. irregularis, gametangia and zygospores from Illinois. 

 Fig. 4. — 5. juellebornci, gametangia and zygospores from Nyassa Lake re- 

 gion, Africa. After Schmidle. Fig. 5. — S. microspora, zygospores resulting 

 from lateral conjugation, from Szechwan, China. Alter Jao. Figs. 6-7. — 5. 

 hollandiae, gametangia and zygospores from New (luinea. After Taft. 

 Fig. 8. — S. rivularis, gametangia and zygospores from Kansas. Figs. 9-10. — 

 S. bijormis, lateral and scalariform conjugation and zygospores from China. 

 After Jao. Figs. 11-12. — S. hyalina, lateral and scalariform conjugation, and 

 resulting zygospores, also a parthenospore from Mississippi. Figs. 13-14. — 

 S. pseudoneglccta, lateral and scalariform conjugation, and zygospores from 

 Moravia. After Czurda. Fig. 15. — 5. columbicma, gametangia and zygo- 

 spore from Colombia, South America. After Czurda. Fig. 16. — S. parvi- 

 spora, gametangia and zygospores from Florida. After Wood. Fig. 17. — S. 

 turjosa, gametangia, zygospore, and vegetative cell from Spain. After Gay. 



