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56
ZYGNEMATACEAE
i6. Zygnemopsis quadrata Jao 1935. Sinensia. 6, p. 573, PI. 2,
Figs. 26-30.
Vegetative cells 13-16/U x 29-71 /^; 2 (rarely 3 or 4) chromatophores;
conJLigaiion scalariform; fertile cells slightly geniculate; zygospores in
the conjugating lubes often extending into the gametangia; zygospores
compressed-ovoid to quadrangular-ovoid, 38-48/a x 45-6o)u. x 29-32/x;
outer wall smooth, transparent, usually remote from the median layer;
median layer golden yellow, scrobiculate; pits about 3^ in diameter,
1.5-2.5/X apart, suture prominent. (PI. IX, Figs. 4-5.)
China, Szechwan, rice farms and pools.
17. Zygnemopsis sphaerospora Randhawa 1938. Proc. Indian
Acad. Sci. 8, p. 131, Fig. 16.
Vegetative cells 14-16^1 x 45-50/A, with 2 chromatophores; reproduction
by zygospores; conjugation scalariform; zygospores com-
pressed-globose, 34-38/^ in diameter; median spore wall chocolate
brown, punctate; pits about .5//. in diameter. (PI. IX, Figs. 6-7.)
India, Fyzabad, U.P., May, 1938.
18. Zygnemopsis lamellata Randhawa 1937. Proc. Indian Acad.
Sci. 5, p. 302, Figs. 3-4.
Vegetative cells 13-18 /x x 32-52 m, with 2 stellate chromatophores;
reproduction by zygospores; conjugation scalariform, some gametangia
lengthening to /u-; 98 zygospores usually compressed, quadrately ovoid,
sometimes compressed-globose; sporangia with thick, lamellate walls;
zygospores 36-48 ^u x 36-52/^1; outer wall transparent; median wall of
2 layers, of which the outer is blue and undulate at full maturity, and
the inner finely scrobiculate, yellow to brown in color. Sometimes there
are also yellow granules between the walls. (PI. IX, Figs. 8-9.)
India, Fyzabad, U.P., February to April, 1937.
19. Zygnemopsis transeauiana Randhawa 1938. Proc. Indian
Acad. Sci. 8, p. 132, Fig. 17.
Vegetative cells 14-18/x x 25-50 ju., with 2 chromatophores more or
less rounded and near the middle of the cell, regardless of its length;
reproduction by aplanospores. During the development of the sporangium
the cells may elongate to 90-144/1 and increase in thickness to i9Ai.
As the protoplast contracts, pectic compounds and cellulose accumulate,
and the middle of the sporangium enlarges in diameter (up to 35^)-
The outer spore wall is colorless and adherent to the pectic gel. Between
this wall and the median wail yellow or brown granules may
accumulate. The median wall is ovoid to compressed-globose, 16-25 /a x