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178
ZYGNEMATACEAE
Vegetative cells (xy-y^ii x 96-160/^1, with plane end walls; 2 chro-
matophores, making 4 to 6 turns; conjugation scalariform; large tubes
formed by both gametangia; fertile cells cylindric or enlarged; zygospores
ellipsoid, 54-60^ x 80-90/'; median spore wall smooth, brown.
(PI. XXVIII, Fig. 6.)
India, Fyzabad, May, 1938.
106. Spirogyra RHizoiDES RandHawa 1938. Proc. Indian Acad.
Sci. 8, pp. 354-56.
Vegetative cells 26-28/^ x 75-125/11, with plane end walls; chromatophores
2-3, making 1-2 turns in the cell; rhizoids well developed,
made up of i or 2 cells with chromatophores; conjugation scalariform;
tubes formed by both gametangia; fertile cells slightly inflated; zygo-
spores ovoid, 36-38 /x X 52-58 /i; median spore wall thick, smooth, pale
yellow.
India, Hoshiarpur, March, 1930.
In the original description, the median spore wall is given as "bluish."
This appearance may have resulted from diffraction of light. I did not find
it in the specimens examined.
107. Spirogyra dubia Kiitzing 1855. Tabulae phycologicae. 5,
p. 8, PI. 24, Fig. 4.
Vegetative cells 40-50 i". x 60-250 m, with plane end walls; 2 to 3
chromatophores, making 2 to 8.5 turns; conjugation scalariform; tubes
formed by both gametangia; fertile cells inflated; zygospores ovoid,
/li 42-50 X 54-67 /x; median spore wall yellow-brown, smooth. (PI.
XXVIII, Fig. 8.)
United States: Iowa; Illinois; Michigan; Pennsylvania; Massachusetts.
Europe; Australia; South Africa; China.
108. Spirogyra puncticulata Jao 1935. Trans. Amer. Micros. Soc.
54, p. 4, PI. I, Fig. 9.
Vegetative cells 1 6-22/1 x ft, 48-240 with plane end walls; filaments
attached by rhizoids; chromatophores 2, rarely 1, making 1.5 to 5 turns
in the cell; conjugation scalariform; tubes formed by both gametangia;
fertile cells fusiform or cylindrically inflated to 29-36 /t; zygospores
ovoid, 25-32/1 x 41-58/1; median wall densely punctate, yellow. (PI.
XXVIII, Fig. 9.)
United States: Massachusetts, Woods Hole.
109. Spirogyra aequinoctialis G. S. West 1907. Jour. Linn. Soc.
of London Bot. 38, p. 105, PI. 5, Figs. 1-2.
Vegetative cells 23-25/1 x 90-150/', with plane end walls; 3 (rarely
2) chromatophores, making 1-1.5 turns; conjugation scalariform; tubes