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SPIROGYRA 185
United States: Widely distributed from Colorado to the east coast.
Germany and France; widely reported in other countries but not neces-
sarily this species; China and India.
This species is frequent in streams and ponds in the northern Central
States, attached to underwater objects at first, later floating free. Although
described by Hilse in 1863, it was not reported in fruit until 1887 by WoUe.
Zygospores were described by Borge from the upper Rhine region in 1894.
These two publications establish the above description for S. fiuviatilis.
Under this name Czurda (1932) described two forms of different dimensions
with ellipsoid spores and 3-5 chromatophores and the tube formed by
the male cell. His illustration, however, has 2 chromatophores and the tubes
are formed by both gametangia. These plants evidently belong near S.
smithti (No. 116). Krieger follows Czurda's description.
134. Spirogyra africana (Fritsch) Czurda 1932. Siisswasserflora
Mitteleuropa. 9, p. 201.
Vegetative cells 50-60 /a x i 50-500 /x, with plane end walls; 3 to 4
chromatophores, making 1.5 to 4 turns; conjugation scalariform; tubes
formed by both gametangia; receptive cells enlarged or inflated on both
sides up to 96 /x; zygospores ovoid, 60-67 /a ^ 78-90 /x; median spore wall
brown, irregularly and shallowly corrugate.
Africa, Cape Colony; Guatemala (Kellerman Coll.).
Very similar to 5. fiuviatilis, but has larger dimensions throughout.
135. Spirogyra notabilis Taft 1944. Ohio Jour. Sci. 44, p. 238.
Vegetative cells y>-^JlJ^ x 92-230 /x, with plane end walls; 2, 3, or 4
chromatophores, making i to 3 turns in the ceil; at conjugation the cell
walls are notably thickened; conjugation scalariform between short
gametangia; tubes formed by both gametangia, but more by the male;
receptive gametangia enlarged near the spore; zygospores ovoid, 48-57 ^tx
X 78-105^1; median spore wall of 2 yellow-brown layers, of which the
outer is conspicuously punctate, the inner, reticulate and finely
verrucose.
United States: Texas, Austin, April 19, 1938.
The layers of the median wall are distinct and are among the most
beautifully ornamented walls in the genus.
136. Spirogyra grossii Schmidle 1901. Allgem. Bot. Zeitschr. 7,
P-3-
Vegetative cells 40-42 /a x 50-1 20 /a, with plane end walls; 3 chro-
matophores, making 2 to 4 turns in the cell; conjugation scalariform;
tubes apparently formed by the male gametangia; fertile cells inflated
to ju.; 64 zygospores ovoid, ju, 43-51 x 64-118 /x; median spore wall irreg-
ularly corrugate. (PI. XXX, Fig. 6.)
Yugoslavia; Manchuria; India.