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PLATE XXX \' 1 1 



Spik()(;vi<a 



Fig. r. — S. lamhertuinii, gamctangia and zygospore- trom Maine. Figs. 

 2-3. — S. microgranulata, gametangia, zygospore, and wall pattern from 

 China. After Jao. Figs. 4-6. — S. spree/ana, aplanospore, scalaritorm and 

 lateral conjugation, and zygospores from Massachusetts. Fig. 7. — S. tsing- 

 taoensis, gametangia and zygospores from China. After L. C. Li. Fig. 8. — 

 S. arta, gametangia and zygospores from Szechwan, China. After Jao. 

 Fig. 9. — S. tumida, gametangia, zygospores, and cylindrically distended 

 sterile cells from Szechwan. After Jao. Fig. 10. — S. articulata, aplanospores 

 and sporangia from Columbus, Mississippi. Figs. 11-12. — S. regularis, gam- 

 etangia, zygospores, median spore wall markings. After Cedercreutz. 

 Fig. I 5. — S. laxistrata, gametangia and zygospore from Szechwan. After 

 Jao. Fig. 14. — S. croasdaleae, gametangia and zygospores from Naushon 

 Island, Massachusetts. After Blum. Fig. 15. — S. dcnticulata, aplanospore 

 and part of sporangium from Massachusetts. After Blum. Fig. 16. — 5. 

 lamellosa, gametangia, conjugating tubes, and zygospore from Szechwan. 

 After Jao. Figs. 17-18. — S. venusta, conjugating filaments, zygospore, and 

 spore wall pattern from Szechwan. After Jao. Fig. 19. — S. protecta, con- 

 jugating filaments, zygospores, and optical section of spore wall. 



