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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.