3o8 ZYGNEMATACEAE 



PLATE XXXII 



Spirogyra 



Figs. 1-3. — S. oblata, vegetative cell, gametangia, zygospores, and de- 

 tails of spore wall structure from Hangchow, China. After Jao. Fig. 4. — S. 

 jormosa, zygospores and receptive gametangia from Illinois. Fig. 5. — S. jas- 

 siensis, lateral conjugation and zygospores from Bessarabia. After Teo- 

 doresco. Fig. 6. — 5. crassa, receptive gametangia and zygospores from 

 France. After Petit. Fig. 7. — 5. manoramae , gametangia and zygospores 

 from India. After Randhawa. Figs. 8-9. — S. jatobae, receptive gametangia, 

 zygospores, and vegetative cell from Brazil. Figs, io-ii. — S. maxima, 

 zygospores and spore wall pattern from South America. After Borgc. 

 Figs. 12-13. — S. heeriana, gametangia and zygospores, also spore wall pat- 

 tern, from Vienna, Austria. After Czurda. Figs. 14-15. — S. lenticularis, 

 receptive gametangia, zygospores seen from different angles, and spore wall 

 pattern, from Cape Town, South Africa. 



