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296
ZYGNEMATACEAE
PLATE XX\'I
Spirocyka
Figs. 1-2. S. maiavillosa, vegetative cell and aplanospores from north-
ern Brazil. Fic. 3. S. irregularis, gametangia and zygospores from Illinois.
Fig. 4.—5. juellebornci, gametangia and zygospores from Nyassa Lake re-
gion, Africa. After Schmidle. Fig. 5. S. microspora, zygospores resulting
from lateral conjugation, from Szechwan, China. Alter Jao. Figs. 6-7.—5.
hollandiae, gametangia and zygospores from New (luinea. After Taft.
Fig. 8. S. rivularis, gametangia and zygospores from Kansas. Figs. 9-10.
S. bijormis, lateral and scalariform conjugation and zygospores from China.
After Jao. Figs. 11-12. S. hyalina, lateral and scalariform conjugation, and
resulting zygospores, also a parthenospore from Mississippi. Figs. 13-14.
S. pseudoneglccta, lateral and scalariform conjugation, and zygospores from
Moravia. After Czurda. Fig. 15.—5. columbicma, gametangia and zygo-
spore from Colombia, South America. After Czurda. Fig. 16. S. parvi-
spora, gametangia and zygospores from Florida. After Wood. Fig. 17. S.
turjosa, gametangia, zygospore, and vegetative cell from Spain. After Gay.