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68 ZYGNEMATACEAE<br />
globose bodies; reproduction by zygospores and parthenospores en-<br />
closed by sporangial walls; conjugation scalariform and lateral; zygospores<br />
compressed-globose or subglobose, 29-38/1. x 22-25/1; median<br />
spore wall yellow to brown, sharply scrobiculate on the faces, only<br />
slightly scrobiculate or striate near the prominent equatorial suture;<br />
parthenospores without prominent suture. (PI. XII, Figs. 1-5.)<br />
China, Nanking and Chungking.<br />
11. Zygogonium exuvielliforme Jao 1935. Amer. Jour. Bot. 22,<br />
p. 768.<br />
Vegetative cells 13-22^ x 48-105/i.; chromatophorcs 2; conjugation<br />
lateral and scalariform; spores formed in the greatly enlarged conjugating<br />
tubes; zygospores compressed-globose with distinct or prom-<br />
inent sutures, 35-42/1 x 38-54 /a in diameter; median wall yellow to<br />
brown, thick, lamellate, with scattered pits except near the equatorial<br />
suture. (PI. XII, Figs. 6-8.)<br />
South America, Colombia, Lake Macotama at 14,400 feet altitude.<br />
12. Zygogonium plakountiosporum Jao 1935. Amer. Jour. Bot.<br />
22, p. 767.<br />
Vegetative cells 16-22/i. x 30-155M, with 2 chromatophorcs close to<br />
the nucleus; conjugation lateral and scalariform; tubes greatly dis-<br />
tended containing the spores; zygospores compressed-globose with<br />
colorless outer wall; median wall brown, with equatorial suture more<br />
or less prominent, and with arching ridges forming a zone of pits on<br />
one side of the suture; spore dimensions 35-41 /^ x 40-68 ju. x 14-20 /i.<br />
(PI. XII, Figs. 9-11.)<br />
South America, Colombia, Lake Macotama at 14,400 feet altitude.<br />
This species is remarkable for its asymmetrically ornamented spores.<br />
13. Zygogonium indicum (Randhawa) Transeau. nom. nov.<br />
Proc. Indian Acad. Sci. 8, p. 140 (as Zygnema heydrichii<br />
var. indicum Randh.).<br />
Vegetative cells 18-22 /a x 50-90 /a, with 2 chromatophorcs near the<br />
nucleus; conjugation usually lateral, rarely scalariform; zygospores<br />
ovoid 22-27 /i. ^ ^i~S7/^' median wall greenish-blue to dark blue; scrobiculate<br />
with pits about 2/1 in diameter; parthenospores smaller and<br />
similar.<br />
India, Fyzabad, U.P., March 12, 1938.<br />
This species is placed in the genus Zygogonium because the spore is<br />
separated from the gametangia by a wall. In appearance it resembles<br />
Zygogonium heydrichii, a species having yellow spores.
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