Ulva flexuosa Wulfen

9. Enteromorpha tubulosa Kuetz.
Plate 14, figs. 4, 5
Frond simple or with short proliferations, usually near the base,
but with occasional longer proliferations some distance above the
base, tubular and nearly cylindrical throughout, or enlarging upward
from a delicate cylindrical stipe and becoming compressed above;
cells squarish, 11-1 S/a diam., arranged in longitudinal series through-
out, less distinctly so in the upper mature parts; membrane 15-24/x
diam., walls equally thickened oil both sides, with cells squarish or
slightly elongated radially, chromatophore filling the outer end of
the cell.
(¡rowing attached to rocks in the lower littoral belt, or floating in
intertwined masses in pools in salt marshes. Central California.
Kuetzing, Tab. Phyc., 1856, p. 11, pi. 32, f. 2; Ahlner, Entero-
morpha, 1877, p. 49, f. 9a, 9b. Enteromorpha prolifera var. tubulosa
Collins, Green Alg. N. A., 1909, p. 203; Collins, Holden and Setchell,
Phyc. Bor.-Amer. (Exsicc.), no. 462 (Key West, Florida).
Kuetzing’s figure of Enteromorpha tubulosa represents a simple
plant, but -J. G. Agardh (1883, p. 128) states that it branches. The
main frond is tubular and slender, of nearly uniform diameter
throughout. Our specimens are all branched more or less, but usually
from near the base. The membrane may be thickened on both sides
or not at all. There has been some difference of opinion among writers
as to the proper relationship of this plant, but it seems best to us to
retain it as an independent species.
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Enteromorpha tubulosa Kuetz.
Fig. 4. A portion of a small frond showing the linear arrangement of cells.
X 250.
Fi*;.
5. A section of a frond. X 250.
02139168