Oedogonium crenulatocostatum var. aureum Tilden

Josephine E. Tilden. American Algae.

123. Oedogonium crenulato-costatum Wittr. var. aureum n. var.

Oogonia single or 2—3 seriate, elliptical or oboviform, opening by a pore
in upper portion; oospores nearly filling the oogonia, exospore smooth,
endospore crenulate-costate, orange colored (aurantiacus); supporting
cell similar to the other vegetative cells; filament of male plant slightly
smaller than that of female; antheridial cells alternating with vegeta-
tive cells, 2—5 celled; terminal cell (sometimes an oogonium) obtuse;
vegetative cells 10—13 mik. in diameter, 3.5—6 times longer; oogonia
32—37 x 40—50 mik.; oospores 29—30 x 38—39 mik.; antheridial cells
10 x 10 mik.

In overflow from small hillside spring. Water a little warm.

Between the Middle and Upper Geyser Basins, Yellowstone National Park.

J. E. T. 2 J] 1896.

The endospore in this plant is crenulate-costate but not longitudinally so; the
dimensions of the vegetative cell differ a little from those of the type descrip-
tion; the mature oospores are bright orange-colored, a character not mentioned
in the specific description; it occurs in thermal, flowing water instead of cold,
stagnant water. In all other points the variety corresponds exactly with the
species.

With Phormidium rubrum (No. 186).

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Josephine E. Tjlden. American Algae.

123. Oedogonium crenulato-costatum Wittr. var. aureum n. var.

Oogonia single or 2—3 seriate, elliptical or oboviform, opening by a pore
in upper portion; oospores nearly filling the oogonia, exospore smooth,
endospore crenulate-costate, orange colored (aurantiacus); supporting
cell similar to the other vegetative cells; filament of male plant slightly
smaller than that of female; antheridial cells alternating with vegeta-
tive cells, 2—5 celled; terminal cell (sometimes an oogonium) obtuse;
vegetative cells 10—13 mik. in diameter, 3.5—6 times longer; oogonia
32—37 x 40—50 mik.; oospores 29—30 x 38—39 mik.; antheridial cells
10 x 10 mik.

In overflow from small hillside spring. Water a little warm.

Between the Middle and Upper Geyser Basins, Yellowstone National Park.

J. E. T. 2 J] 1896.

The endospore in this plant is crenulate costate but not longitudinally so; the
dimensions of the vegetative cell differ a little from those of the type descrip-
tion; the mature oospores are bright orange-colored, a character not mentioned
in the specific description; it occurs in thermal, flowing water instead of cold,
stagnant water. In all other points the variety corresponds exactly with the
species.

With Phormidium rubrum (No. 186).

NEW YORK BOTANICAL GARDEN

02107355

02107355