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Coll.).
SPIROGYRA 169
Dutch New Guinea, Hollandia (Robert Sigafoos Coll.), Biak (Britton
In the Biak collection several instances of scalariform conjugation were
found. See also Number 72.
70. Spirogyra submarina (Collins) Transeau 1915. Ohio Jour.
Sci. 16, p, 25. Collins. 1909. Green Algae of North America,
p. no.
Vegetative cells 21-32 a*- x 6'^-iy'^iJi, with plane end walls; 2 to 3
chromatophores, making 1.5 to 3 turns; conjugation scalariform; tubes
formed by both gametangia; fertile cells enlarged; zygospores ellipsoid,
/tt 31-37 X 56-120 /a; median spore wall yellowish-brown, smooth.
United States: Massachusetts; Connecticut.
Bermuda; China, Peiping and Nanking (Li Coll.).
71. Spirogyra rivularis (Hassall) Rabenhorst 1868. Flora Europaea
Algarum. 3, p. 243.
Vegetative cells 36-41 ;«. x 100-400 /x, with plane end walls; 2 to 3
chromatophores, making 2.5 to 3.5 turns in the cells; conjugation scalar-
iform, rare; tubes formed by both gametangia; fertile cells shortened,
cylindric or enlarged; zygospores ellipsoid, 35-42 a^ x 60-100 /x; median
spore wall yellow or brownish-yellow, smooth. (PI. XXVI, Fig. 8.)
United States: Kansas; Iowa; Michigan; Alabama; Kentucky.
Widely distributed in Europe, South Africa, New Guinea, and several
provinces of China.
Most of the early records of this species are based on vegetative material.
It is said to occur in running water, attached to submerged objects. In the
vegetative condition it certainly cannot be distinguished from S. decimina,
which in America is also frequently attached and floating in small streams.
See note under S. turfosa (No. 79).
72. Spirogyra biformis Jao 1935. Sinensia. 6, pp. 594-95, PI. 6,
Fig. 66.
Vegetative cells 38-48/t x 64-i5o(-i9o) /i, with plane end walls;
chromatophores (i-)2-3, making 1.5 to 4.5 turns; conjugation usually
lateral, rarely scalariform; tubes formed by both gametangia; fertile
cells cylindric or slightly enlarged, sometimes shortened to 38 /x; sterile
cells some times swollen to 58 /x in diameter; zygospores ellipsoid with
rounded ends, 36-51 ^u. x 60-83^",; median spore wall yellow, smooth.
(PI. XXVI, Figs. 9-10.)
China, Szechwan; New Guinea (Robert Sigafoos Coll.); Philippines,
Leyte (Britton Coll.); Brazil (Drouet Coll.). Compare with Number 69.
In the collection from Leyte conjugation is scalariform, elsewhere lat-
eral. In one of the collections from Leyte a few cells have 4 chromatophores.