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SPIROGYRA 165
ellipsoid, ^P-^^i^ x 50-65 ft; median spore wall yellow, irregularly and
coarsely punctate. (PI. XXIV, Fig. 13.)
United States: Kentucky (Mclnteer Coll.).
South America, Paraguay; South Africa.
54. Spirogyra robusta (Nygaard) Czurda 1932. Trans. Roy. Soc.
S. Africa. 20, Pt. II. Siisswasserfiora Mitteleuropa. 9,
p. 187.
Vegetative cells 29-35 /a i^ diameter, with plane end walls; i chromatophore;
conjugation scalariform; tubes formed by both cells; fertile
cells inflated, 43-65 a*, in diameter; zygospores ellipsoid, 32-60 /x x
54-104 /i; median spore wall yellowish-brown, with faint, irregular
scrobiculations. (PI. XXIV, Figs. 14-15.)
South Africa.
55. Spirogyra subpapulata Jao 1935. Sinensia. 6, p. 597, PL 7,
Figs. 74-75.
Vegetative cells 22-26 ^ x 41-166 /x, with plane end walls; i chromatophore,
making 2-7 turns in the cell; reproduction by either zygo-
spores or aplanospores; conjugation scalariform; tubes formed by both
cells; sterile cells usually swollen to 58 yn in diameter; zygospores ellip-
soid, with pointed ends, 21-29 ja x 41-60^1; aplanospores subglobose or
ellipsoid, 22-26 /^ x 32-48 /x; median wall finely and densely punctate,
yellow at maturity. (PI. XXV, Figs. 1-2.)
China, Szechwan, December, 1933, and January, 1934 (Jao Coll.).
This species resembles Spirogyra papulata Jao, but has smaller vege-
tative cells and punctate spores.
56. Spirogyra papulata Jao 1935. Sinensia. 6, p. 598, PL 7, Figs,
76-78.
Vegetative cells 28-32 /x x 64-176)0,, with plane end walls; chromatophore
single, containing large pyrenoids; conjugation scalariform;
tubes formed by both gametangia; fertile cells usually shortened and
inflated on the conjugating side, up to 55 /x in diameter; sterile cells
sometimes swollen to 64^^; zygospores ellipsoid, very rarely subglobose,
22-32 /x x 35-55 ^t; median spore wall irregularly reticulate, golden yellow
at maturity. (PI. XXV, Figs. 3-5.)
China, Szechwan, January, 1933.
57. Spirogyra scrobiculata (Stockmayer) Czurda 1932. Siiss-
wasserfiora Mitteleuropa. 9, p. 182.
Vegetative cells 30-40 /a x 30-90 /a, with plane end wails; i chromatophore;
conjugation scalariform; tubes formed by both gametangia;
fertile cells inflated on the conjugating side; zygospores ellipsoid.