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52
ZYGNEMATACEAE
Descriptions of Species
1. Zygnemopsis sikancensis Li 1939. Bull. Fan Mem. Inst. Biol.,
Botany. 9, p, 225.
Vegetative cells 4-6 /^i x 38-68 m, each with 2, sometimes 4, chro-
matophores; conjugation scalariform; zygospores quadrangular-ovoid,
1 8-22 M X 1*6-22 ix, filling the tube and extending into the gametangia;
median spore wall yellow and punctate. (PI. VIII, Figs. 1-2.)
China, Sikang, Yunnan.
2. Zygnemopsis orientalis (Carter) Transeau 1944. Ohio Jour.
Sci. 44, p. 244. Records Bot. Surv. India. 9, p. 281. 1926
(as Debarya desmidioides var. orie?itale Carter).
Vegetative cells 6-7/^ x 30-67/1; conjugation scalariform; zygo-
spores quadrangular, pillow-form, 20-25 /a on a side, filling the broad
tubes and dividing the gametangia; median spore wall golden-brown,
whether smooth or punctate not stated. (PI. VIII, Figs. 3-5.)
India, Matiana on the Tibetan road from Simla, altitude 8,500 feet,
April 30, 1907.
3. Zygnemopsis gracilis Randhawa 1938. Proc. Indian Acad. Sci.
8, p. 133, Fig. 18.
Vegetative cells 6-7 /j. x 40-70 /x; reproduction by aplanospores
formed in spindle-shaped sporangia, with spores in the median region;
spores globose to ovoid, about 20 jx in diameter; color and markings on
the median wall undetermined. (PI. VIII, Figs. 6-7.)
India, Makrahi, Fyzabad, U.P., March 12, 1938.
4. Zygnemopsis floridana Transeau 1934. Trans. Amer. Micros.
Soc. 53, p. 215, PI. 18, Fig. 20.
Vegetative cells 7-8 /x x 30-40 (-50) m; chromatophores 2, pillow-
form, each with a pyrenoid; conjugation scalariform; zygospores
formed in the greatly enlarged conjugating tubes and extending but
little into the gametangia which lengthen during conjugation to 50-90 jia;
spores ovoid to quadrate-ovoid, 18-25/1 x 28-30/1; median spore wall
bright yellow, scrobiculate; pits 2-3/1 in diameter and about the same
distance apart. (PI. VIII, Figs. 8-9.)
United States: Florida, Fort Myers, May 25, 1933 (Blaydes Coll.).
5. Zygnemopsis minuta Randhawa 1937. P^oc. Indian Acad. Sci.
5, p. 312, Fig. 8.
Vegetative cells 8-1 2 /t x ^0-70/1, each with 2 compressed-ovoid
chromatophores; conjugation scalariform, dissociation occurring dur-
ing or after conjugation; zygospores globose to quadrate-globose.