zy(;nemataceae 



PLATE XIII 



MoUGEOTIA 



Fig. I. — M. angusta, gametangia and zygospore. ;\tter Hassall. Fig. 2. — 

 A/, tcnuissima, zygospore and gametangia. After de Bary. Figs. 3-5 — M. 

 parvula, zygospores and subtending gametangia from Finland; third figure, 

 aplanospore and sporangium from Burgaw, North Carolina. Figs. 6-9. — 

 M. tubijera, figures in order illustrate an early stage in conjugation; usual 

 form of mature zygospore; zygospore resulting from conjugation through 

 lateral wall of one of the tubes; the last exemplifies a pair of tubes that 

 failed to unite and produced a pair of parthenospores. Note that the tubes 

 have about the same diameter as the vegetative cells. The cells are too long 

 to be illustrated on this plate. Specimens from Wilmington, North Carolina. 

 Figs. 10-12. — M. calcarea, aplanospore, three zygospores, and the form of 

 zygospore which has been distinguished as "bicalyptrata."" First two figures 

 after Wittrock. Fig. 13. — M. recurva, usual position of zygospore between 

 gametangia. Fig. 14. — M. ellipsoidea, zygospore and gametangia. After 

 G. S. West. Figs. 15-17. — M. adnata, zygospores resulting from scalariform 

 and lateral conjugation, from India. After Iyengar. Fig. 18.— .\/. victor- 

 iensis from Australia, gametangia and zygospore enclosed by thick pectic 

 layer. After West. Fig. 19. — A/, chlamydata, zygospore with remnants of 

 outer layer of sporangium wall surrounding each half of the conjugating 

 tube, from Ecuador. After Prescott. Fig. 20. — A/, cotopi/xitnsis, zygospore 

 pattern, from volcano Cotopaxi, Ecuador. After Prescott. 



