256 ZVGNEMATACEAE 



PLATE \'I 



ZvCNliNfA 



Fig. I. — Z. stt'/linuni, zygospores formed by lateral and scalaritorm con- 

 jugation frt)ni Illinois. (See also Plates I and V for figures of partheno- 

 spores and aplanospores.) Fig. 2. — Z. cylmdrosporuni, zygospores and 

 gametangia from Macedonia. After Czurda. Fig. 3. — Z. bohcmtcum, 

 gametangia and zygospores from Bohemia. After Czurda. Fig. 4. — Z. 

 mirandum, zygospores, vegetative cell, and akinete, from Austin, Texas. 

 After Taft. Fig. 5. — Z. inconspicuum, zygospores and gametangia from 

 Manchuria. After Czurda. Figs. 6-7. — Z. aassiuscidum , zygospores and 

 details of spore wall from Cape Town, South Africa. Fig. 8. — Z. chalybeo- 

 spermum, lateral and scalariform conjugation, with resulting zygospores 

 from Bohemia. Modified from Czurda. Figs. 9-10. — Z. cyaneum, scalar- 

 iform and lateral conjugation from Bohemia. After Czurda. Figs. 11-13. — 

 Z. collinsianum, zygospores in relation to gametangia, zygospore, and 

 aplanospore with details of spore wall markings from central Illinois. 

 Fig. 14. — Z. excompressum, zygospores and sjx)re markings from Bohemia. 

 After Czurda. Fig. 15. — Z. azureum, zygospores and gametangia from 

 Medford, Oklahoma. After Taft. Fig. 16. — Z. carinthiacum, zygospore, 

 gametangia, and spore wall markings from Szechwan, China. After Jao. 

 Fig. 17. — Z. peliosporum, zygospores and gametangia from Alabama. 



