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SPIROGYRA i6i
qucntly misapplied than this one. Looking over the named collections one
finds 5. lutetiana attached to all sorts of forms in which the cells and spores
are irregular, although Petit's description and figures are perfectly clear.
38. Spirogyra aplanospora Randhawa 1938. Proc. Indian Acad.
Set. 8, pp. 336-37.
Vegetative cells ix 20-26 x 40-90 /a, u^ith plane end walls; i chro-
matophore, making 3 to 6 turns; fertile and sterile cells irregularly in-
flated; no conjugation seen; reproduction by aplanospores which are
ovoid to globose, 24-30 /x
XXIII, Figs. 17-18.)
x 30-50 /x; median wall brown, smooth. (PI.
India, Punjab, Dasuya, lanuary, 1929.
The dimensions suggest that this is an ecological form of S. mirabilis
(Hassall) Kutzing. When Spirogyras are growing in water of warm temperatvire
and low oxygen content they frequently have distorted cells, and
Randhawa's figures are typical of this condition.
39. Spirogyra polymorpha Kirchner 1878. Algen. Kryptogame it-
flora Schlesien, p. 124.
Vegetative cells 22-30 /x x 45-230 m, with plane end walls; t or
rarely 2 chromatophores, making i to 10 turns; conjugation scalar-
iform; tubes formed by both gametangia; fertile cells inflated to 26-64 /x;
zygospores polymorphic, varying from ellipsoid to ovoid and globose,
22-32 /i. X 25-35 m; median spore wall yellow, smooth. (PI. XXIII,
Figs. 14-15.)
Widely reported in Europe. Recently figured and completely described
by Jao from Szechwan, China. (Sinensia. 6, p. 589, PI. 5, Figs. 56-57. 1935.)
40. Spirogyra velata Nordstedt 1873. "Beskriftung ofver en
nyart af Slagtet Spirogyra." Lunds Univ. Arss^rift. 9, p. i,
PI. I.
Vegetative cells 29-41
jj^ x 60-200 /x, with plane end walls; i or rarely
2 chromatophores, making 2.5 to 6 turns; conjugation scalariform;
tubes formed by both gametangia; fertile cells cyUndric or somewhat
enlarged; zygospores mostly ovoid to cylindric-ovoid, rarely ellipsoid,
/x 37-57 X 60-100 ;".; outer wall of 2 layers, of which the second is transparent
and scrobiculate; the median is chitinous, yellow-brown, smooth.
(PI. XXIV, Fig. I.)
United States: Iowa; Illinois; Kentucky; Indiana.
Germany; Russia; South Africa; China.
The original description of this species gives but i chromatophore.
Nevertheless, in Nordstedt's collection from Lund (1882) 2 chromatophores
are present in some of the cells. Petit states that the diameter of the vege-
tative cells of the specimens collected at Paris ran as high at 54 /x. Possibly
his collection included another species.