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Coll.).
SIROGONIUM 235
United States: Mississippi, Greenville, August, 1945 (L. A. Whitford
India, Fyzabad, Upper Punjab, September-October.
Differs from S. ventersicum in being larger in all dimensions, and in
having a black rather than a brown median spore wall.
9. SiROGONiuM iLLiNoiENSE (Transcau) G. M. Smith 1933. Freshwater
Algae of the United States, p. 557. Transeau. Amer.
Jour. Bot, 1, p. 296, Figs. 1-3. 19 14.
Vegetative cells 65-85 /x x 100-310 ft; 6 to 9 chromatophores, nearly
straight or making up to i turn in the cell; both gametangia more or
less reflexed, the receptive one inflated; zygospores ellipsoid, 85-1 15 ji^ x
140-190^1; median wall yellow with scattered protuberances connected
by a more or less prominent reticulum. (PI. XL, Figs. 12-13.)
United States: Originally collected at Lerna, Illinois, from a single
prairie pond now destroyed; not found elsewhere in central Illinois during
7 years of collecting. Recently collected in eastern Oklahoma by C. E. Taft.
10. SiROGONiuM Hui (Li) Transcau 1944. Ohio four. Sci. 44,
p. 244. Bull. Fan Mem. Inst. Biol., Botany. 8, p. 91 (as
Spirogyra hui Li). 1938.
Vegetative cells 82-108 /^ x 140-256 ft, with plane end walls; 5
to 10
chromatophores; receptive gametangia inflated to 150ft; zygospores
ellipsoid to ovoid, 88-ii5ft x 133-192 ft; outer spore wall thin, colorless;
median wall of 2 layers; outer layer thin, irregularly wrinkled; inner
layer yellow, verrucose; the inner wall thin and transparent. Akinetes
86-92 ft X 64-96 ft are common. (PI. XL, Figs. lo-ii.)
China, Kiangsi.
This is the largest species in the genus and the only one with a double
median spore wall. Described as a Spirogyra, but the figure is sufficient evidence
that it should be classified as a Sirogonium. The description has been
amended slightly after examination of the type material.
11. Sirogonium indicum Singh 1938. ]our. Indian Bot. Soc. 17,
p. 384, Fig. 6B.
Vegetative cells 65-80 ft in diameter, with approximately 7 chromatophores
which are nearly straight; conjugation scalariform between
reflexed gametangia; receptive gametangia greatly inflated; zygospores
ellipsoid, y^-^oiJ. x i35-i65ft; median spore wall thick, yellow, and
scrobiculate. (PI. XL, Fig, 9.)
India.
12. Sirogonium phacosporum Skuja 1949. Nova Acta Soc. Sci.
Upsali. Ser. 3, 14, p. 103, PI. 22, Figs. 1-5.