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SPIROGYRA 219
iform; tubes formed by both gametangia; fertile cells enlarged or in-
flated; zygospores ovoid, 39-45 /x x fi, 60-90 yellow-brown; median wall
reticulate. (PI. XXXVII, Figs. 11-12.)
Finland.
The description does not state whether the median wall is single or
double. It is included here as a species closely related to the preceding and
characterized by smaller spores and a definite number of chromatophores.
258. Spirogyra crassivallicularis Jao 1935. Trans. Amer. Micros.
Soc. 54, p. 2, PL I, Fig. 4.
Vegetative cells 54-58 ft x 168-420 ft; end walls replicate; chromatophores
usually 4, rarely 3, making 1.5 to 3.5 turns in the cell; conjuga-
tion scalariform; tubes formed by both gametangia; fertile cells en-
larged, or inflated up to 80 /x; zygospores ovoid, 52-71 /x x 90-144 /x;
median wall of 2 layers, of which the outer is thin, wrinkled, and yel-
low; the inner thick, yellow-brown and reticulate with thick irreg-
ularly crenulate ridges. (PI. XXXIX, Fig. 6.)
United States: Massachusetts, Woods Hole.
259. Spirogyra granulata Jao 1935. Sinensia. 6, p. 613, PI. 11,
Figs. 1 16-17.
Vegetative cells i". 32-35 x 147-280 /ti, with replicate end walls; 2
chromatophores, making 2.5 to 6 turns in the cell; conjugation lateral;
tubes formed by both gametangia; receptive gametangia enlarged toward
the middle; zygospores ovoid to cylindric-ovoid, 45-55/^^ x 93-131 /x;
median wall double, of which the outer layer is thin and irregularly
wrinkled; the inner, granulate and slightly wrinkled, yellowish-brown.
(PL XXXIX, Figs. 7-8.)
China, Szechwan, December, 1933.
See also Number 261, .S. pseudogranulata Ley.
260. Spirogyra quinquelaminata Jao 1935. Sinensia. 6, p. 615,
PL II, Figs. 121-22.
Vegetative cells 41-45^1 x 154-280 /x, with replicate end walls; 2
chromatophores, making 2 to 4 turns in the cell; reproduction by zygo-
spores and aplanospores; conjugation scalariform; tubes formed by both
gametangia; fertile cells enlarged toward the middle; sterile cells some-
times inflated up to 70 /x; zygospores ovoid, 51-55 M x 83-144^1, with 5
layers in the spore wall; outer spore wall of 2 layers, of which the outer
is thin and colorless; the inner up to ju. 3.5 in thickness and distinctly
lamellate; median spore wall yellow-brown, also of 2 layers, of which
the outer is thin and somewhat wrinkled; the inner, coarsely and irreg-
ularly reticulate, the ridges being crenulate to dentate; aplanospores