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172
ZYGNEMATACEAE
Vegetative cells 83-92 /x x 43-256 m, with plane end walls; 2-4 chro-
matophores, usually 3, making .5-2 turns in the cell; conjugation scalar-
iform; tubes formed by both gametangia; receptive gametangia cylin-
dric or slightly enlarged; zygospores mostly ellipsoid, 5^-79/^ x 83-128 /x;
all walls smooth; median wall yellow. (PI. XXVII, Fig. 3,)
United States: Indiana, Sullivan County, September 10, 1936.
Resembles S. setijormis but differs in chromatophore complement and
in the proportionately smaller spores.
82. Spirogyra setiformis (Roth) Kiitzing 1845. Phycologia Ger-
manica, p. 223.
Vegetative cells 90-1 15 j". x 100-225 /i, ^^'^'^^ plane end walls; chromatophores
4, making .5 to 4 turns in the cells; conjugation scalar iform;
tubes formed by both gametangia; receptive gametangia cylindric;
zygospores ellipsoid, 85-1 00 ^ x 11 5-1 60 /x; median wall brown and
smooth. (PI. XXVII, Figs. 4-5.)
United States: Iowa; Illinois; Indiana; Pennsylvania; New Jersey;
Massachusetts.
Widely reported from European countries.
This is certainly not the species described by Czurda (1932) which has
6 to 10 chroma tophores. The earliest figures published agree with those of
Petit (1880) in having 4 chromatophores. In any event, the description
given here characterizes a species that is very common in the east central
states and agrees with Borge's interpretation in the first edition of the
SiisswasserfJora, 9. In the Handbuch der Pflanzenanatomie (Bd. VI, 2 Teil.,
p. 65) Czurda (1937) figures this species with 4 chromatophores.
83. Spirogyra elliptica Jao 1935. Smensia. 6, p. 596, PI. 6, Fig. 72.
Vegetative cells 115-128^^ x 128-568 /a, with plane end walls; 4 to 6
chromatophores, making i to 3 turns in the cell; conjugation scalariform;
tubes formed by both gametangia; fertile cells cylindric and
shortened; zygospores ellipsoid with pointed ends, 82-106 /a x 144-202 /x;
median wall smooth, yellow-brown. (PI. XXVII, Fig. 6.)
China, Szechwan, January, 1933.
84. Spirogyra wollnyi de Toni 1889. Sylloge Algarum. 2, p. 754.
Wollny. Hedwigia. 1887, p. 166 (as S. elegans).
Vegetative cells 90-100^^ x 270-350 /a, with plane end walls; 6 to 8
chromatophores, making 2 to 2.5 turns in the cell; conjugation scalar-
iform; tubes formed by both gametangia; fertile cells cylindric; zygo-
spores elhpsoid, 90-100/U, X 140-190/A; median wall yellow-brown,
smooth, with distinct suture.
CJcrmany, Dresden; South Africa, Queenstown Cape, July, 1930
(Stephens Coll.).