3o6 ZYGNEMATACEAE 



PLATE XXXI 



Spikogyra 



Figs. 1-2. — 5. cchinata, zygospores, gamclangia, and details of spore 

 wall from Montgomery, Iowa. After Blum. Figs. 3-5. — S. reinhardii, veg- 

 etative cell, gametangia, and spore wall patterns, from Brazil. After Borge. 

 Fig. 6. — S. hunanensis, chromatophores, gametangia, and zygospore from 

 China. After Jao. Fig. 7. — S. discoidea, vegetative cell, gametangia, and 

 zygospores from Cape Town, South Africa. Fig. 8. — S. pellucida, gam- 

 etangia, and two views of zygospore from England. After West. Fig. 9. — 5. 

 sphaerospora, gametangia, conjugating tubes, and zygospores from Finland. 

 After Hirn. Fig. id. — S. sinensis, gametangia and zygospore from Hang- 

 chow, China. After L. C. Li. Figs. n-13. — S. colligata, twisted filament, 

 end walls of cells, gametangia, and zygospores from England. Alter 

 Hodgetts. Figs. 14-15. — S. majuscula, zygospores and an aplanospore from 

 Illinois. Fig. 16. — S. glabra, gametangia and zygospores from V'ienna, 

 Austria. After Czurda. Figs. 17-18. — 5. bellis, gametangia, zygospore, and 

 spore wall details. After Czurda. 



