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SPIROGYRA 159
cells to globose, 28-38/1 x 50-83 /i; median spore wall yellow, smooth.
(PI. XXIII, Fig. 5.)"
United States: Common throughout.
Widely distributed in Europe, reported from East and South Africa,
Asia, South America, and Australia. In Kentucky (Mclnteer Coll.) this
species was found hybridizing with S. porticalis.
The distinctive features of this very common species are the ovoid
spores and the nearly cylindric sporiferous cells.
31. Spirogyra oltmannsii Huber-Pestalozzi 1930. "Algen aus
dem Knysnawalde in Siidafrica." Zeitsch. f. Bot. 23,
p. 448.
Vegetative cells 23-27 /u, x 70-125 /x, with plane end walls; i chromatophore,
zygospores unknown; sporangia cylindric; aplanospores
ovoid, 22-26/1 X 30-42 /x; median spore wall outwardly [.^] scrobiculate.
Described from immature specimens. (PI. XXIII, Fig. 6.)
South Africa.
32. Spirogyra suecica Transeau 1934. Ohio Jour. Sci. 34, p. 420.
(^iS*. varians var. gracilis) Borge 1923. Arl{. Bot. 6, p. 11,
PI. I, Fig. 2.
Vegetative cells 26-29 /x ^ 80-175 /(-, with plane end walls; i chro-
matophore, making i to 4.5 turns; conjugation scalariform or rarely
lateral between some cells; tubes formed by both gametangia; fertile
cells inflated on both sides, usually more on the conjugating side, up to
60 /J.; zygospores usually ovoid, 32-39/1 x 38-60/1; median spore wall
yellow, smooth. (PI. XXIII, Fig. 7.)
United States: Iowa; Ohio; Florida.
Sweden; France.
33. Spirogyra gallica Petit 1880. Les Spirogyres des environs de
Paris, p. 23, PI. 6, Figs. 1-3.
Vegetative cells 72-75/1 x 1 50-500 /t, with plane end walls; i chro-
matophore, making 4 to 8 turns in the cell; conjugation scalariform;
tubes formed by both gametangia; fertile cells cylindric; zygospores
ovoid to ellipsoid, 62-66/1 x 90-110 /t; median spore wall yellow, smooth.
(PI. XXIII, Fig. 8.)
France; Belgium; Germany.
This is the largest of the Spirogyras with i chromatophore; differs from
S. condensata of about the same dimensions in the ovoid spores and the
much longer vegetative cells.
34. Spirogyra lacustris Czurda 1932. Siisswasserflora Mitteleu-
ropa. 9, p. 176, Fig. 182.