2<58 ZY(;NliMAT.\c:KAI- 



PLATE \'n 



Zygnema 



Fig. I. — Z. piiH'/JCiUJiinj, gamctangia and zygospores troni Oklahoma. 

 After Taft. Fig. 2. — Z. ornatum, gametangia and zygospores Irom Nan- 

 king, China. After L. C. Li. Fig. 3. — Z. excommune, gametangia and 

 zygospores from Bohemia. After Czurda. Fig. 4. — Z. borzae, aplanospore 

 and sporangium from Transylvania. After Krieger. Figs. 5-7. — Z. sponta- 

 neum, vegetative cell, akinete, early stages of aplanospore development, and 

 mature spores from South Africa. The last figure, of a specimen from 

 C.hina, is after lao. Fig. 8. — Z. irregularc, aplanospore and sporangium 

 from Brandenburg, Germany. After Krieger. Fig. 9. — Z. cylindricum , 

 aplanospores and vegetative cell from Hilliards, Ohio. Fig. 10. — Z. schwubci, 

 aplanospore from southern Chile. After Krieger. Fig. ii. — Z. sterile, 

 akinetcs with laminate walls from Madison County, Ohio. Fig. 12. — 

 Z. hypnosporiitn , aplanospores in a filament having a thick pectic sheath 

 with radial structural lines Irom Rhodesia, South Atrica. ,\ttcr Rich. 

 Fig. 13. — Z. subcyimdricum, aplanospore and sporangium from Bohemia. 

 After Czurda. Fig. 14. — Z. quadrungulutum, aplanospores from Hunan, 

 China. After Jao. Fig. 15. — Z. f^wangtungense, zygospores and gametangia 

 from China. After Ley. Figs. 16-18. — Z. tenestre, two forms of aplan- 

 ospores and a zygospore from Fyzabad, India. After Randhavva. 



