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SPIROGYRA 203
199. Spirogyra undulisepta Randhawa 1938. Proc. Indian Acad.
Set. 8, p. 352.
Vegetative cells 13-18 ju. x 96-154 /t with semireplicate end walls; i
chromatophore, making 3 to 5 turns; conjugation scalariform; tubes
formed by both gametangia; receptive gametangia inflated in the mid-
dle up to 30-42 /a; zygospores ellipsoid, 20-30 m x 40-53 m; median spore
wall yellow-brown, with an undulate outer surface. (PI. XXXV, Fig. 4.)
India, Fyzabad, Upper Punjab, February 8, 1937.
SPECIES WITH REPLICATE END WALLS
200. Spirogyra tenuissima (Hassall) Kiitzing 1849. Species Algarum,
p. 437.
Vegetative cells 8-13,a x 40-250^1, with replicate end walls; i chro-
matophore, making 3 to 6 turns; conjugation lateral and scalariform;
tubes formed by both cells; fertile cells greatly inflated or enlarged
toward the middle; zygospores and aplanospores ellipsoid, /tx 25-32 x
iu.; 40-70 median spore wall yellow, smooth. (PI. XXXV, Figs. 5-6,)
United States: Abundant in the eastern half in early spring.
Canada; Europe; Asia; South America; Africa; Australia; New Zealand.
Highly variable in dimensions within the above limits, also in the
angles formed by laterally conjugating cells. Several species and varieties
have been described which are not listed here. If these variants are recognized,
many more can be separated on equally good grounds. The same
statement holds for the next species, S. inflata.
Found hybridizing with S. weberi at Belding, Michigan. Spores in cells
of S. weberi filaments were ovoid, in the S. tenuissima filaments, ellipsoid.
201. Spirogyra inflata (Vaucher) Kiitzing 1843. Phycologia
Generalis, p. 279.
Vegetative cells 15-20/^ x 45-230 /x, with repHcate end walls; i chromatophore,
making 2.5 to 6 turns; conjugation lateral and scalariform;
tubes formed by both gametangia; fertile cells inflated to /x.; 35-48 zygospores
and aplanospores ellipsoid, 27-36 /x x 50-76 /x; median spore wall
yellow, smooth. (PI. XXXV, Figs. 7-8.)
coast.
United States: From Minnesota and Louisiana eastward to the Atlantic
Southern and eastern Canada; Europe; Asia; Africa.
202. Spirogyra cylindrica Czurda 1932. Siisswasserfiora Mittel-
europa. 9, p. 150.
Vegetative cells i3-i6ft x I40-350a