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256
ZVGNEMATACEAE
PLATE \'I
ZvCNliNfA
Fig. I.—Z. stt'/linuni, zygospores formed by lateral and scalaritorm con-
jugation frt)ni Illinois. (See also Plates I and V for figures of partheno-
spores and aplanospores.) Fig. 2.—Z. cylmdrosporuni, zygospores and
gametangia from Macedonia. After Czurda. Fig. 3.—Z. bohcmtcum,
gametangia and zygospores from Bohemia. After Czurda. Fig. 4.— Z.
mirandum, zygospores, vegetative cell, and akinete, from Austin, Texas.
After Taft. Fig. 5.—Z. inconspicuum, zygospores and gametangia from
Manchuria. After Czurda. Figs. 6-7.—Z. aassiuscidum , zygospores and
details of spore wall from Cape Town, South Africa. Fig. 8.—Z. chalybeo-
spermum, lateral and scalariform conjugation, with resulting zygospores
from Bohemia. Modified from Czurda. Figs. 9-10.—Z. cyaneum, scalar-
iform and lateral conjugation from Bohemia. After Czurda. Figs. 11-13.
Z. collinsianum, zygospores in relation to gametangia, zygospore, and
aplanospore with details of spore wall markings from central Illinois.
Fig. 14.—Z. excompressum, zygospores and sjx)re markings from Bohemia.
After Czurda. Fig. 15.—Z. azureum, zygospores and gametangia from
Medford, Oklahoma. After Taft. Fig. 16.—Z. carinthiacum, zygospore,
gametangia, and spore wall markings from Szechwan, China. After Jao.
Fig. 17.—Z. peliosporum, zygospores and gametangia from Alabama.