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212 ZYGNEMATACEAE
ctangia; fertile cells cylindric; zygospores ellipsoid, 32-35 /i x 37-42 m;
median wall brown; aplanospores, 30-34/1 x 35-40 /n, similar.
Java, Tjibodas.
234. Spir(x;yra articulata Transeau 1934. Trans. Amer. Micros.
Soc. 53, p. 226, Pi. 22, Figs. 67-69.
Vegetative cells 24-28 /i x 360-600/1, with replicate end walls; i
chromatophore, making 3 to 8 turns in the cell; zygospores unknown;
reproducing by ellipsoid aplanospores, 36-40 /i x 60-88//; median spore
wall yellow, smooth; sporangia cylindric, enlarged or slightly inflated,
sometimes straight, often bowed or bent toward the middle. (PI.
XXXVII, Fig. 10.)
United States: Mississippi, Columbus; Indiana, Vigo County (Ben
Smith Coll.).
235. Spirogyra latviensis (Skuja) Czurda 1932. Siisswasserfiora
Mitteleuropa. 9, p. 147. Skuja. Acta Horti Bot. Univ.
Latviensis. 3, p. 109. 1928 (as S. protecta forma). Also
described as S. petitiana Transeau 1934.
Vegetative cells 20-25 /j. ^ 100-250/1, with replicate end walls; i
chromatophore, making 3 to 5.5 turns in the cell; conjugation scalar-
iform; tubes formed by both gametangia; fertile cells inflated to 30-40/1;
zygospores ovoid to cylindric-ovoid, 29-39 /t x 75-1 15 /a; outer hyaline
spore wall of 2 layers, of which the outer is thin; the inner, thick, ver-
rucose, with short, pointed elevations; median wall smooth, yellowbrown.
United States: Minnesota; New York (Blum Coll.); Massachusetts
(Bullard Coll.).
Latvia.
236. Spirogyra venusta Jao 1935. Sinensia. 6, p. 614, PI. 10, Figs.
118-19.
Vegetative cells 25-27/A x 175-350/i, with replicate end walls; i
chromatophore, making 3 to 6 turns in the cell; conjugation scalar-
iform; tubes formed by both gametangia; sterile cells inflated at the
ends; fertile cells cylindric or enlarged; zygospores cylindric-ellipsoid,
26-32/i X 67-84/1; outer spore wall of 2 layers, of which the inner is
colorless, strongly scrobiculate; median spore wall smooth and yellow.
(PI. XXXVII, Figs. 17-18.)
China, Szechwan, December 27, 1934.
237. Spirogyra protecta Wood 1872. Smithson. Contribu. Knowledge.
19, p. 165, PI. 14, Fig. 3. Cleve. Nova Acta Reg.
Soc. Sci. Upsali. Ser. 3, 6, p. 26. 1868 (as S. calospora