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SPIROGYRA 179
formed by both gametangia; fertile cells inflated, oblong; zygospores
ovoid, or oblong-ovoid, 41-43 /^ x 52-71 /i.; median wall densely scrobic-
ulate. (PI. XXVIII, Fig. 10.)
United States: Wisconsin (Prescott Coll.).
Central Africa.
1 10. Spirogyra rhizopus Jao 1936. Amer. Jour. Bot. 23, p. 55,
Figs. 10-12.
Vegetative cells 25-32 /a x 80-250 m, with plane end walls; 2 chromatophores,
making 1.5 to 4 turns; basal cell with much expanded and
irregularly lobed holdfast; conjugation scalariform; tubes formed by
both gametangia; fertile cells quadrangularly inflated, sometimes oblong
in form, to 57^".; zygospores ellipsoid, 35-42;^. x 64-ioo/x; outer spore
wall thick, lamellose, colorless; median spore wall brown, irregularly
reticulate. (PI. XXVIII, Figs. 11-13.)
China, Peiping, July, 1927.
111. Spirogyra dictyospora Jao 1935. Sinensia. 6, p. 599, PL 8,
Fig. 84.
Vegetative cells 28-32 /ax 55-144M, with plane end walls; chroma-
tophores 3, sometimes 2, making 2-5 turns in the cell; conjugation
scalariform; tubes formed by both gametangia; fertile cells enlarged up
to /a;
55 zygospores ovoid, 41-55 /x x 61-103 ft; median spore wall retic-
ulate, yellow to yellow-brown. (PI. XXVIII, Fig. 14.)
China, Chungking, February, 1930.
112. Spirogyra natchita Transeau 1934. Trans. Amer. Micros.
Soc. 53, p. 225.
Vegetative cells 32-36^1 x 120-200 ju, with plane end walls; i to 3
(mostly 2) chromatophores; conjugation scalariform; tubes formed by
both gametangia; fertile cells inflated to 62 /a; zygospores ovoid,