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SPIROGYRA 157
23. Spirogyra affinis (Hassall) Petit 1880. Les Spirogyres des
environs de Paris, p. 18, PL 3, Figs. 13-14.
Vegetative cells 25-30 /x x 35-90 /a, with plane end walls; i chromatophore,
making i to 3.5 turns; conjugation lateral and scalariform;
tubes formed by both gametangia; fertile cells globosely inflated; sterile
cells not inflated; zygospores ellipsoid, 28-33 /a ^ 30-50 /"> median spore
wall yellow, smooth.
United States: Michigan; Alaska.
Widely reported from Europe; Jamaica; China, Kiangsi.
24. Spirogyra catenaeformis (Hassall) Kiitzing 1849. Species
Algarum, p. 438.
Vegetative cells 24-32 /a x 50-135 /a, with plane end walls; i chromatophore,
making i to 6 turns; reproduction by both zygospores and
aplanospores; conjugation scalariform and lateral; tubes formed by
both gametangia; fertile cells enlarged or inflated, fusiform, sterile cells
also inflated; zygospores and aplanospores ellipsoid, ju. 27-33 ^ 55-90 A*-;
median spore wall yellow, smooth. (PI. XXII, Fig. 12; PI. XXIV,
Fig. 16.)
United States: Generally distributed throughout.
Widely distributed in Europe; reported from China, India, and from
East and South Africa.
Distinguished from S. affinis by the longer vegetative cells and the
greatly inflated sterile cells; from S. suecica by the symmetrical fusiform
inflation of the fertile cells and the ellipsoid spores; from S. subsalina by the
yellow spores, generally smaller dimensions, and the less marked inflation
of the fertile cells.
25. Spirogyra subsalina Cedercreutz 1924. Acta Soc. pro Fauna
et Flora Fennica. 55 (2), p. 4, Fig. 2.
Vegetative cells 28-38 /x x 70-190 m, with plane end walls; i chro-
matophore, making 2 to 4.5 turns; conjugation scalariform; tubes
formed by both gametangia; fertile cells inflated to 49-56 /j.; zygospores
ellipsoid, 28-38 /a x 42-76 /i-; median spore wall brown, smooth. (PL
XXII, Fig. 9.)
United States: Mississippi, Natchez, April, 1925.
Finland.
26. Spirogyra flavescens (Hassall) Kiitzing 1849. Species Algarum,
p. 438.
Vegetative cells 10-14^1 x 30-50 /x, with plane end walls; i chromatophore,
making i to 3 turns; conjugation scalariform; tubes formed
by both gametangia; fertile cells inflated; zygospores ovoid, i". 20-23 x
25-40 /a; median spore wall yellow, smooth. (PL XXIII, Fig. i.)