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300 Z^'(;NE\fATACF.AH
PLATE XXVIII
Spirogyra
Figs. i-2.^.S'. plena, receptive gametangia and zygospores formed by
lateral and scalaritorm conjugation from Burma. After West. Fig. 3. S.
szcchwanensis, gametangia and zygospore from Chungking, China. After
Jao. Fig. 4. S. jugalis, receptive gametangium and zygospore from Illinois.
Fig. 5.—5. margaritata, receptive gametangium and zygospore from spec-
imens collected at Dresden, (jermany. Fig. 6. S. bichromatophora, gam-
etangia and zygospores from India. After Randhavva. Fig. 7. S. baileyi,
gametangia and zygospores from Australia. After Schmidle. Fig. 8.—5.
dubia, gametangia and zygospores. After Kiitzing. Fig. 9. S. puncticulata,
zygospores and gametangia from Massachusetts. After Jao. Fig. 10. S.
aequinoctialis, zygospore and gametangia from central Africa. After West.
Figs. 11-13. S. rhizopus, zygospores, gametangia, holdfast, and details of
spore wall, from Peiping, China. After Jao. Fig. 14. S. dictyospora, veg-
etative cell, gametangia, and zygospores from Chungking, China. After Jao.
Figs. 15-16.—5. ]ossa, gametangia, zygospore, and spore wall details from
Massachusetts. After Jao. Figs. 17-18. S. smithii, gametangia, zygospores,
and details of outer and inner layers of median spore wall. Figs. 19-20. S.
schmidtii, zygospores and gametangia from Koh Chang, Siam. After West.