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ZYCINEMATACEAE
PLATE XXIV
Spirogyra
Fig. I. S. velata, spore wall pattern. After Jao. Fig. 2. S. occt-
dentalis, gamctangia and zygospores from Illinois. Fig. 3. S. lutcospora,
zygospore and receptive gametangium from Bohemia. After Czurda. Fig. 4.
— S. sulcata, zygospores and gametangia from Wisconsin. After Blum.
Fig. 5. S. obovata, gametangia and zygospores from Szechwan. China.
After Jao. Fig. 6. S. asiatica, zygospore from Tibet. After Czurda. Fig. 7.
—5. lagerheimii, lateral conjugation and zygospore from Sweden. After
Wittrock. Fig. 8. S. tajtiana, gametangia, zygospore, and sterile cells from
Texas. After Taft. Fig. 9. S. perjorans, gametangia and zygospores from
Florida. Fig. 10. S. minutijossa, zygospore and gametangia from Massa-
chusetts. After Jao. Fig. ii.— S. porangabae, gametangia, zygospores, and
sterile cells from northern Brazil. Fig. 12. S. skjujae, gametangia and zygo-
spores from India. After Randhawa. Fig. 13. S. hoehnei, gametangia and
zygospore from Kentucky. Figs. 14-15. S. robusta, gametangia and zygo-
spores from South Africa. After Nygaard. Fig. 16.—5. catenaejormis, a not
uncommon form of a laterally conjugating filament from Illinois. Fig. 17.
— S. scrobiculata, unusual form of receptive gametangia and conjugation
through end wall of filament from Illinois.