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zygnemataceaf:
PL ATI-. IV
ZvGNhMA
Figs. 1-2.—Z. synadelphuin, zygospores and vegetative cells enclosed by
pectic sheath with prominent structural lines. Figure i from Latvia, after
Skuja; Fig. 2 from Douglas Lake, Michigan. Figs. 3-4.—Z. coirulvum
zygospores and gametangia, and spore wall pattern, trom Bohemia. After
Czurda. Fig. 5.—Z. }{iangsiense, zygospores and gametangia from China.
After L. C. Li. Fig. 6.—Z. ralfsii, conjugation pattern after G. S. West.
Fig. 7.—Z. micropunctatum , zygospore and gametangia from Douglas Lake,
Michigan. Figs. 8-9.—Z. circumcarinatum , zygospore and details of spore
wall from Bohemia. After Czurda. Fig. 10.—Z. paivhusl{ae, gametangia
and zygospores from Oklahoma. After Taft. Fig. ii.—Z. carinaturn, zygo-
spores and gametangia from Oklahoma. Fig. 12.—Z. extenuc, zygospores
and beginning of lateral conjugation from Szechwan, China. After Jao.
Fig. 13.—Z. tholosporum, zygospore from Uruguay. After Magnus and
Wille. Figs. 14-15.—Z. tenue, zygospores, gametangia, and details of spore
wall from China. After Jao. Fig. 16.—Z. cylindrospermum , zygospores and
gametangia from the Shetland Islands. After W. & G. S. West. Figs. 17-
18.—Z. hausmannii, zygospores and gametangia from Austria. After
Czurda.