266 ZYGNEMATACEAE 



PLATE XI 



Zygogonium 



Figs. 1-3. — Z. pcctositm, zygospores and gametangia, modes of branch- 

 ing, and aplanospore from Louisiana. After Taft. Figs. 4-6. — Z. /uinsgirgii, 

 filaments with aplanospores and spore markings, from India. After 

 Schmidle. Figs. 7-8. — Z. talguppcnsc, sporangia aiul aplanospores from 

 India. After Iyengar. Figs. 9-1 i. — Z. capensc, aplanospores and sporangia, 

 details of spore wall, from Stellenbosch, South Africa. After Hodgetts. 

 Fig. 12. — Z. punctatum , zygospore and elongated gametangia from Louisi- 

 ana. After Taft. Figs. 13-15. — Z. heydrichii, lateral conjugation and zygo- 

 spores, release of spore through separation of two halves of sporangium 

 wall, and akinete from Sydney, Australia. After Schmidle. Figs. 16-19. — 

 Z. \umaoer7se, aplanospores and branching filament from northern India. 

 After Randhawa. 



