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1 68 ZYGNEMATACEAE
aplanospores broadly ellipsoid, 28-36/i. x 43-6o(-72) /x; median wall
smooth, vellow-brovvn ; sporangia enlarged or slightly inflated. (PI.
XXVI, Figs. 1-2.)
Brazil, Belem, July 9, 1935 (Drouet Coll.).
This species resembles Number 29, S. mirabilis (Hassall) Kutzing but
differs in having 2 or 3 chromatophores.
66. Spirogyra irregularis Nageli 1849. In Kiitzing, Species Algarum,
p. 440; also 1855, Tab. Phycoth., 5, PI. 23, Fig. 2.
Vegetative cells 32-37 y^ x 65-250 /x, with plane end walls; 2 to 4
chromatophores, making .5 to i turn; conjugation scalariform; tubes
formed by both gametangia; fertile cells cylindric; zygospores ellipsoid
to cylindric-ellipsoid, 30-36 ju. x 45-90^11; median spore wall yellowishbrown,
smooth. (PI. XXVI, Fig. 3.)
United States: Illinois; Missouri (Drouet Coll.).
Widely reported from western and central Europe.
67. Spirogyra fuellebornei Schmidle 1902. Englcr's Bot. ]ahrb.
32, p. 76, PI. 3, Fig. 2.
Vegetative cells 40-42 /x x 120-240 m, with plane end walls; 3 chro-
matophores, making i to 2 turns; conjugation scalariform and lateral;
tubes formed by both gametangia; fertile cells cyhndric; zygospores
ellipsoid, more or less pointed, 32-44 /x x 50-80 ju.; median spore wall
smooth, yellow-brown. (PI. XXVI, Fig. 4.)
United States: Wisconsin (Prescott Coll.).
Africa; Nyassa Lake region; Central America, Panama.
68. Spirogyra microspora Jao 1935. Sinensia. 6, pp. 593-94, PI. 6,
Fig. 65.
Vegetative cells 35-38 /^ x 64-131 m, with plane end walls; 2 chro-
matophores, broad with large pyrenoids, making 1.5-3.5 turns in the
cell; conjugation lateral; tubes formed by both gametangia; fertile cells
cylindric; zygospores ellipsoid, 29-32^ x 51-61 /x; median wall smooth,
yellow at maturity. (PI. XXVI, Fig. 5.)
China, Szechwan, November, 1933.
69. Spirogyra hollandiae Taft 1947. Ohio Jour. Sci. 47, p. 173.
Vegetative cells 36-41 /a x 60-192/i., with plane end walls; 2 chro-
matophores, broad with large pyrenoids, making 1.5-2.5 turns in the
cell; conjugation usually lateral; tubes formed by both gametangia;
sterile cells sometimes inflated; receptive gametangia cylindric or en-
larged; zygospores ellipsoid with rounded ends, 38-42/1 x 62-78 /x;
median wall smooth, bright yellow at maturity. (PI. XXVI, Figs. 6-7.)