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SPIROGYRA 173
This imperfectly described species of Wollny has been completed by
the additional data gleaned from Miss Stephens' collection.
85. Spirogyra wrightiana Transeau 1938. Amer. ]our. Bot. 25,
p. 527, Figs. 16-17.
Vegetative cells 130-165/u, x 275-43o(-69o) ^i, with plane end walls;
6-8 chromatophores, making 1-3 turns in the cell; conjugation unknown;
aplanospores mostly ellipsoid, 100-126 /j. x 158-206 /a; sporangia
cyhndric and of the same dimensions as the vegetative cells; spore walls
in the material seen probably not mature, smooth and colorless. (PI.
I, Figs. 4-5; PI. XXVII, Figs. 7-8.)
South America, Brazil, Parahiba, July 14, 1934 (Drouet Coll.).
Very similar in appearance to the preceding species; and, as is usual in
aplanosporic species, the spores are small compared with the volume of the
vegetative cells in which they form.
86. Spirogyra yunnanensis Li 1939. Bull. Fan Mem. Inst. Biol.,
Botany. 9, p. 224, PL 27, Fig. 2.
Vegetative cells 98-1 10 /u. x 224-268 /x, with plane end walls; chromatophores
6-8, making 2-4 turns in the cell; conjugation scalar iform;
tubes formed by both gametangia; fertile cells cylindric and shortened;
zygospores ellipsoid, 88-96 /^ x 120-180^; median spore wall smooth,
yellow. (PI. XXVII, Fig. 9.)
China, Yiinnan.
87. Spirogyra hatillensis Transeau 1936. Brittonia. 2, p. 171.
Vegetative cells 120-130111 x 108-450/4, with plane end walls; 6 to 8
chromatophores, having .5 to 4 turns; conjugation scalariform; tubes
formed by both gametangia; fertile cells cylindric; sterile cells more or
less swollen; zygospores ellipsoid, 85-125/1 x 130-160/1; median spore
wall brown, smooth. Spores small compared with volume of gam-
etangium. (PI. XXVII, Fig. 10.)
United States: North Carolina (Whitford Coll.).
Puerto Rico, Hatillo, February, 191 5 (Wille Coll.).
88. Spirogyra ellipsospora Transeau 1914. Amer. Jour. Bot. 1,
p. 294.
Vegetative cells 125-150/1 x 125-500 /t, with plane end walls; 3 to 8
chromatophores, making .4 to 5 turns; conjugation scalariform; tubes
formed by both gametangia; fertile cells cylindric; zygospores ellipsoid,
more or less pointed, 100-140 /x x 160-255/1; median spore wall smooth,
yellow-brown. (PI. XXVII, Fig. 11.)
Generally distributed in the eastern half of the United States, but no
reports from the southern coastal plain.
Central China.