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SPIROGYRA 201
matophore, making 3 to 7 turns; conjugation scalar iform; conjugating
tubes formed almost wholly by the male gametangia; fertile cells in
groups of 2 or 4, rarely continuous, inflated on the inner side to 50 /x;
zygospores ellipsoid, 37-42 i^t x 57-100 /a; median spore wall yellow,
minutely punctate. (PI. XXXIV, Fig. 9.)
United States: Wisconsin (Prescott Coll.); Illinois; Arkansas (Couch
Coll.).
192. Spirogyra corrugata Transeau 1934. Trans. Amer. Micros.
Soc. 53, p. 229.
Vegetative cells (30-) 32-36 (-40)^1 x 1 40-280 ( -400 /x,
) with plane
end walls; i to 3 chromatophores, making 2 to 4 turns; conjugation
scalariform; tubes formed by the male gametangia, usually long and
broad; fertile cells solitary or in pairs (rarely in series) between vege-
tative cells, shortened and inflated to 40-60 /a; zygospores ovoid, 42-60 /a
X 8o-i20jtt; median spore wall of 2 layers, outer thin, coarsely and irreg-
ularly corrugate; inner yellow or brownish-yellow, finely reticulate.
(PI. XXXIV, Figs. lo-ii.)
United States: Illinois; Mississippi; Alabama (Thut Coll.); Tennessee
(Bold Coll.); Oklahoma (Taft Coll.); West Virginia (Hamblin Coll.).
China, Szechwan (Jao Coll.).
193. Spirogyra rugulosa Ivanof 1902. From Bot. Zentralbl. 93,
p. 383. 1903. Teodoresco. Bot. Zent. Beth. 21, p. 192,
Figs. 81-87. 1907.
Vegetative cells 47-57 /^ x 100-350 /j., with plane end walls; i chromatophore,
making 3 to 11 turns; conjugation scalariform; tubes formed
by male gametangia; fertile cells shortened, inflated on the conjugating
side; zygospores ellipsoid or ovoid, 45-52 /x x 102-127;",; median spore
wall yellow-brown, finely punctate. (PI. XXXIV, Fig. 14.)
United States: Illinois, Charleston, in an old prairie pond.
Russia, Bologoe; Rumania, Chita.
194. Spirogyra wabashensis Tiffany 1927. BoL Gaz. 83, p. 202,
PI. 9, Fig. I.
Vegetative cells 40-50 /^ x 120-400 ju^, with plane end walls; 2 to 4
chromatophores, making .5 to 4.5 turns; conjugation scalariform; tubes
formed by the male gametangia; fertile cells inflated, single or in groups
of 2, alternating with vegetative cells; zygospores ellipsoid, 56-76 /x x
110-150/A; median spore wall yellow, areolate. (PI. XXXIV, Fig. 13.)
United States: Illinois, Brownsville.
195. Spirogyra conspicua Gay 1884. Essai d'une monographie
locale des Conjuguees, p. 91, PI. 4, Fig. 5.