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2i8
ZYGNEMATACEAE
254. Spirogyra nawashini Kasanofsky 1913. Berichte deutsch.
hot. Gesells. 31, p. 55, PI. 3.
Vegetative cells 27-41 /x x 170-325/i, with replicate end walls; 2
(rarely i) chromatophores, with .5 to 1.5 turns; conjugation scalar-
iform; tubes formed by both gametangia; fertile cells fusiform, inflated
to 50-55 m; zygospores ellipsoid to cylindric-ellipsoid, 30-49^1 x 45-1 00 /j-;
median spore wall reticulate, yellow-brown.
Coll.).
United States: Indiana (Ben Smith Coll.).
Ukraine, Kiev; China, Nanking (Li Coll.); South Africa (Stephens
255. Spirogyra tetrapla Transeau 1938. Amer. ]our. Bot. 25,
p. 528, Fig. 6.
Vegetative cells /x, 30-40 x 100-250 /n, with replicate end walls; i or 2
chromatophores, making 2 to 8 turns in the cell; conjugation scalar-
iform; tubes formed by both gametangia; fertile cells inflated, up to
66m; zygospores ellipsoid, 48-58 /j. x 68-88 /a; median wall of 2 layers, of
which the outer is thin and irregularly corrugate; the inner, finely
reticulate, yellow. (PI. XXXIX, Fig. 4.)
United States: Illinois; Indiana; Ohio; Mississippi,
256. Spirogyra reticulata Nordstedt 1880. Bot. Notiser 1880.
p. 118. Wittrock and Nordstedt Algae Exsiccatae, No. 362.
Vegetative cells 28-42 /li x 72-460 /j., usually with replicate end walls;
I to 3 (usually 2) chromatophores, making 2 to 4 turns; conjugation
scalariform and lateral; tubes formed by both gametangia; fertile cells
enlarged or inflated toward the middle to 48-60 /t; zygospores mostly
ovoid, 45-61
/A X 80-120 /i.; median spore wall yellow-brown, of 2 layers,
of which the outer is thin and wrinkled; the inner reticulate. (PI.
XXXIX, Fig. 5.)
United States: Iowa; Oklahoma; Mississippi; eastward to Maine and
south to Florida.
Brazil; Europe; China; India.
This description is amended as to the median spore wall. This wall is
double in both specimens from Brazil upon which Nordstedl's description
is based and is likewise present in the American, European, and Chinese
specimens that I have examined.
257. Spirogyra regularis (Cedercreutz) Krieger 1944. Rabin-
horst's Kryptogamenflora. 13, p. 464. Acta Soc. pro
Fauna et Flora Fennica. 55 (2), p. 3. 1924.
Vegetative cells 21^32 /x x 110-380 m, with replicate end walls; 2
chromatophores, making 4 to 6 turns in the cell; conjugation scalar-