272 ZYGNEMATACEAE 



PLATE XI\' 



MoUGEOTIA 



Fig. I. — M. f^erguclcnsis, zygospores and gamctangia Iroiii ihc Klt- 

 guelen Islands, in the southern Indian Ocean. After Krieger. Fig. 2. — M. 

 maltae, zygospore and gametangia from Latvia. After Skuja. Fig. 3. — 

 A/, reinschii, zygospore by lateral conjugation, from central Illinois. Figs. 

 4-6. — M. sphaerocarpa, zygospores, parthenospores, and aplanospores from 

 Columbus, Ohio. The walls of the gametangia and tubes are often greatly 

 thickened, and the cytoplasmic residues may form a veil around the zygo- 

 spore as in Fig. 5. Figs. 7-8. — A/, scalaris, zygospore by scalariform con- 

 jugation and parthenospore after incomplete lateral conjugation, from 

 Michigan. Figs. 9-10. — A/, jogensis, zygospores after scalariform and lateral 

 conjugation, from India. After Iyengar. Figs. 11-12. — A/, ajncana, aplan- 

 ospore and zygospore from the Philippine Islands. Fig. 13. — A/, hirnii, 

 zygospore and gametangia from Finland. After Hirn. Fig. 14. — A/, ort//- 

 /j/jo/w, zygospore and gametangia from Germany. After Krieger. Fig. 15. — 

 A/, macrospora, zygospore and gametangia from Pennsylvania. After Wolle. 

 Figs. 16-17. — ^^- gt^nuflcxa, zygospores by lateral and scalariform conjuga- 

 tion, from Illinois. Fig. 18. — A/, siibcrassa, zygospore and gametangia from 

 Australia. After G. S. West. 



