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248
ZYGNEMATACEAE
PLATE II
Zygnema
Fig. I.—Usual aiul unusual chromatophores in a filament of Zygnema
collected near Fort Myers, Florida. Fig. 2.—Chromatophorc patterns in
iilaments from West Point, Mississippi, and Pittsburgh, Pennsylvania.
Fig. 3.—Z. oveidanum from Florida, zygospore, parthenospore, and ap-
pearance of chromatophores during conjugation. Fig. 4.—Z. himalayense
from India, scalariform and lateral conjugation and zygospores. In lateral
conjugation the gametes unite through the end walls. After Randhawa.
Figs. 5-6.—Z. lacvispoi-um, vegetative cell, scalariform and lateral conjuga-
tion, and mature zypospore from Falmouth, Massachusetts. After Jao.
Fig. 7.—Z. decussatum, three zygospores and adjoining gametangia from
Charleston, Illinois. Fig. 8.—Z. conspicuutn , zygospores and gametangia,
from central Illinois. Fig. 9.—Z. lawtonianum, zygospores and gametangia
from Medicine Park, Oklahoma. After Taft. Figs, io-ii.—Z. verrucosum,
zygospores, gametangia, and details of spore wall, from Szechwan, China.
After Jao. Fig. 12.—Z. chungii, zygospore patterns from Wuchang, China.
After Li.