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SPIROGYRA 221
zygospores ellipsoid or sometimes cylindric-ellipsoid, 42-50 /x x 80-1 37 /a;
median spore wall of 2 layers, of which the outer is thin, yellow, and
wrinkled; the inner coarsely dentate or tuberculate, yellow-brown at
maturity. (PL XXXIX, Figs. 14-16.)
China, Haimen, May 6, 1937.
Compare with Number 243 and Number 245.
265. Spirogyra peipingensis }ao 1939. Sinensia. 10, p. 155.
Vegetative cells 113-125/^ x (82-) 105-332 /x, with plane end walls;
chromatophores 5 or 6, making .5 to 2.5 turns in the cell; conjugation
scalariform; tubes formed by both cells; receptive gametangia cylindric
and shortened; zygospores lenticular, 100-128 a^ x 82-100 m; median spore
wall smooth, yellow-brown at maturity. (PL XXXIX, Fig. 20.)
China, Peiping, December, 1935.
Belongs near Number 159, S. submaxima Transeau.
266. Spirogyra sphaerocarpa Jao 1939. Sinensia. 10, p. 156.
Vegetative cells 32-40 ^u, x /a, 87-459 with plane end walls; chromatophores
4 or 5, making .5 to i turn in the cell; conjugation scalariform;
tubes formed by both gametangia; receptive gametangia inflated toward
the middle up to 75-87 fi; zygospores lenticular, 62-75 /a x /a; 37-57 median
spore wall densely punctate, yellow-brown at maturity. (PL
XXXIX, Figs. 17-18.)
China, Wenchow, May 13, 1937.
Belongs near Number 161, S. bellis (Hassall) Cleve.
267. Spirogyra subpellucida Jao 1939. Sinensia. 10, p. 157,
Vegetative cells 40-45 /a x 62-225 a