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ZYGNEMA 35
54. Zygnema germanicum Czurda 1932. Susswasserflora Mitteleuropa.
9, p. 125, Fig. 129.
Vegetative cells 26-28 /^ x 30-36 /j.; conjugation scalariform; zygo-
spores in one of the gametangia; receptive gametangia greatly enlarged
or inflated; zygospores globose or compressed-globose, 36-38 /a x 36-45^;
median spore wall brown, thick, pitted; pits 6-7 ju, in diameter. (PI. V,
Figs. 8-9.)
Germany; Czechoslovakia.
55. Zygnema insigne (Hassall) Kiitzing 1849. Species Algarum,
p. 444.
Vegetative cells 26-32 /x x 26-60 ju; conjugation scalariform or lat-
eral; zygospores in one of the gametangia; receptive gametangia cyUn-
dric or enlarged; zygospores globose or subglobose, 27-33 /x ^ 27~35/^5
median spore wall yellow-brown, smooth; aplanospores 28-33 /x, ovoid
to cyUndric-ovoid, otherwise similar. (PI. V, Figs. 10-12.)
United States: California to Massachusetts and New Jersey.
Widely reported from Europe, Australia, South America, and China.
Many of the records of this species are based on specimens with immature,
colorless spores. These specimens should not have been named.
56. Zygnema fanicum Li 1934. Trans. Amer. Micros. Soc. 53,
p. 212, PI. 18, Figs. 17-19.
Vegetative cells 28-33 /x x 28-80 /x; conjugation usually scalariform,
sometimes lateral; zygospores in one of the gametangia; receptive gametangia
cylindric or enlarged; zygospores globose to ovoid, 30-36 /x x
34-42 /a; median spore wall yellow, sharply pitted; pits 4-7 /^ in diameter,
2-3 /x apart, each with a distinct, raised margin; aplanospores
similar to zygospores. (PI. V, Figs. 13-14.)
China, Hupeh, Kiangsi, Anhwei, Szechwan, Shantung.
57. Zygnema subfanicum Jao 1940. Sinensia. H, p, 295, PI. 4,
Fig. I.
Vegetative cells 24-26 /x x 30-65 /j., with 2 stellate chromatophores;
conjugation scalariform; spores formed in one of the gametangia; re-
ceptive gametangia enlarged on the conjugating side; zygospores glo-
bose to subglobose, ju. 29-35 in diameter; median wall pitted; pits 7-8 /x
in diameter, 1.8-2.7^1. apart, yellow-brown in color. (PI. V, Fig. 15.)
China, Hunan.
58. Zygnema transeauianum G. C. Couch 1944. Ohio Jour. Set.
44, p. 277.
Vegetative cells 30-32 /x x 20-60 /x; conjugation scalariform; recep-
tive gametangia enlarged or slightly inflated on the conjugating side;