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298<br />

ZYGNEMATACEAE<br />

PLATE XXVII<br />

Spirogyra<br />

Figs. 1-2. S. nitida, gametangia and zygospores from Szechwaii,<br />

China. After Jao. Fig. 3. S. hymerae, vegetative cell, zygospore, and gam-<br />

etangia from Indiana. After Britton. Figs. 4-5. S. setijormis, gametangia<br />

and zygospore from Charleston, Illinois. Fig. 6. S. elliptica, zygospore and<br />

gametangia from Szechwan, China. After Jao. Figs. 7-8. S. wrightiana,<br />

vegetative cell, aplanospores, and sporangia from Parahiba, Brazil. Fig. 9.<br />

S. yunnanensis, zygospores and gametangia from Yiinnan, China. After<br />

L. C. Li. Fig. 10. S. hatillensis, zygospores and gametangia from Puerto<br />

Rico. Fig. ii.—5. ellipsospora, zygospore and vegetative cell from Illinois.<br />

Fig. 12. S. emilianensis, zygospores and gametangia from Massachusetts.<br />

Fig. 13. S. exilis, gametangia, zygospores, and sterile cell from l^urma.<br />

After West. Figs. 14-15. S. neglecta, zygospores and gametangia. Mod-<br />

ified after Czurda. Fig. 16. S. decimina, zygospores and gametangia.<br />

After Jao. Fig. 17. S. splendida, zygospore and gametangium. After G. S.<br />

West.

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