304 ZYGNEMATACEAE 



PLATE XXX 



Spikogyka 



Figs. 1-2. — 5. brunnca, gametangia, zygospores, and s[)orc wall pattern, 

 from Transvaal. After Fritsch and Rich. Figs. 3-4. — S. scripta, gametangia, 

 and zygospores from Transvaal. After Nygaard. Fig. 5. — S. fluviutdis, 

 receptive gametangium and zygospore from Illinois. Fig. 6. — S. grossii, 

 zygospore from Yugoslavia. After Schmidle. Fig. 7. — S. novae-angliae, 

 gametangia and zygospore from New York. After Blum. Figs. 8-10. — S. 

 verruculosa, vegetative cell, zygospore, and spore wall pattern from Hang- 

 chow, China. After Jao. Figs. 11-13. — S. punctulata, vegetative cell, gam- 

 etangia, zygospore, and cell wall details, from China. After Jao. Fics. 14- 

 16. — S. malmeana, gametangia, zygospores, and spore wall pattern from 

 Brazil. After Borge. Figs. 17-18. — S. echinospora, chromatophores, gam- 

 etangia, zygospore, and median spore wall pattern from New Hampshire. 

 After Blum. Figs. 19-20. — S. d'lluta, conjugating filaments, and character- 

 istic orientation of spores, also spore wall details. In part after Wood. 



