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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.