322 



ZVCXKMATACEAE 



PLATE XXXIX 



Spirogvra 



Figs. 1-3. — S. borysthcnicci, gametangia, zygospore, and optical sections 

 of spore wall from Ukraine. After Kasanofsky and Smirnoff. Fig. 4. — S. 

 tetrapla, vegetative cell, gametangia, and zygospores from central Illinois. 

 Fig. 5. — S. reticulata, gametangia, and zygospore with outer Jiiedian wall 

 partly cut away exposing the reticulations on the inner median wall from 

 Brazil. Fig. 6. — 5. crassivallicularis, gametangia and zygospore from Massa- 

 chusetts. After Jao. Figs. 7-8. — S. granulata, vegetative cell, receptive gam- 

 etangium, and zygospore from Szechwan, China, .\fter Jao. Fig. 9. — S. 

 pseiido granulata, receptive gametangium and zygospore from Tong-Kau, 

 China. After Ley. Figs, io-ii. — S. quinqucUiminata, gametangia, zygo- 

 spore, aplanospore, and details ot spore wall, Ironi Szechwan, China. After 

 jao. Fig. 12. — S. jaoi, gametangia and zygospore from Tong-Kau, China. 

 After Ley. Fig. 13. — S. c he /(^i an gen sis, gametangia and zygospore from 

 W'enchow. China. After Jao. Figs. 14-16. — S. crassispina, scalarilorin and 

 lateral conjugation, zygospores, conjugating tubes, and details of spore wall 

 from Haimen, (-hina. .After Jao. Figs. 17-18. — 5. sphacrocarpa, gametangia 

 and zygospores, trom VW-nchow, China, .\tter Jao. Fig. 19.— 5. subpel- 

 lucida, gametangia and zygospores from Wenchow. After Jao. Fig. 20. — S. 

 pci pin gen sis, gametangia, and zygospores Irom China. After Jao. 



