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282 ZYGNEMATACEAE
PLATE XIX
MOUGEOTIA
Figs. 1-2.—A/, grciril/inui, aplanospore and zygospore from Oneida
Lake, New York. Figs. 3-4. M. viridis, aplanospore and zygospore from
Saugatuck, Michigan. Figs. 5-6. M. producta, aplanospore and zygospore
from Burma. After West. Figs. 7-8.—M. rcgellii, zygospores, face and
lateral views from Greece. After Skuja. Figs. 9-10. M. tumidula, zygo-
spore, aplanospore, and vegetative cell from Illinois. Figs. 11-12.—A/, aus-
tr'iaca, two zygospores from Wiener-Neustadt, Austria. After Czurda.
Figs. 13-14. M. rotundangulata, zygospore and details of spore wall from
Szechwan, China. After Jao. Fig. 15.—A/, punctata, zygospore from
Sweden. After Wittrock. Fig. 16. M. virescens, zygospore from England.
After Hassall. Figs. 17-18.—M. paludosa, two zygospores from England.
After West. Figs. 19-20. M. quadrangulata, aplanospore and zygospore
from Illinois. Fig. 21. M. tropica, aplanospore (in optical section) and a
vegetative cell from Angola, Africa. After West. Figs. 22-23. ^- '"'^""'-
ana, two forms of aplanospores from the same filament, from Miami, Okla-
homa. Fig. 24. M. ventricosa, aplanospores from Sweden. After Wittrock.
Fig. 25. M. rava, aplanospores variously placed in the sporogenous cell,
from Starkville, Mississippi. Figs. 26-28. M. prona, vegetative cell, early
stage of aplanospore formation, and mature aplanospores from High Hill,
Long Island, New York. Fig. 29. M. mayori, an aplanospore from Colom-
bia, South America. After West. Figs. 30-31. M. tenerrima, vegetative
cell and aplanospore from Colombia, South America. Alter West. Fig. 32.
M. suhpahidosa, zygospore from Kwangtung, China. After Ley.