Download PDF

422 University of California Publications in Botany [Vol.8
10. Ectocarpus simulans S. and G.
Fronds 1-2 mm. high, tufted; prostrate filaments irregular, tor-
tuous, distinct ; erect filaments simple, tapering slightly upward, not
piliferous ; cells cylindrical, not constricted at the dissepiments, ll-lSju
diam. in the central part of the filament, 1-2.5 times as long as the
diameter; chromatophores band-shaped, nearly covering the cell, few;
zoosporangia unknown ; gametangia lateral or occasionally terminal,
sessile, narrowly ellipsoidal, blunt, mostly slightly curved, 55-65/i
long, 15-20/* wide.
Growing on Chaetomorpha aerea. Cypress Point, Monterey
County, California.
9-11.
Setchell and Gardner, Phyc. Cont. VI, 1922, p. 412, pi. 45, figs.
The present species resembles, in general, certain forms of Ecto-
carpus pusillus Griffiths (cf. Sauvageau, 1895), but the erect filaments
are much more slender, usually never branched, and with much
smaller gametangia. It forms tufts on Chaetomorpha aerea., whose
filaments are encircled by the prostrate filaments of the Ectocarpus
which form small cushions in their growth over one another. The
gametangia are rather blunt and often more or less curved.
11. Ectocarpus flagelliferus S. and G.
Fronds densely tufted, 3-5 mm. high, attached by a few creeping
filaments and by small, colorless, descending rhizoidal filaments from
the lower cells ; erect filaments simple below, sparingly and alternately
branched above, tapering gradually upward and abruptly at the base,
piliferous when young; cells of the main filaments slightly doliiform,
25-35//, diam., 0.25-1.5 times as long as the diameter ; chromatophores
small, irregular bands or plates, without pyrenoids; zoosporangia
unknoAvn; gametangia very variable in shape and size, fusiform to
cylindrico-conical, mostly lateral on long pedicels, occasionally ter-
minal on short, erect filaments, or long seriate-intercalary on the main
filaments, the lateral 125-200/* long, 28-40/x, broad, the terminal and
intercalary up to 1.5 mm. long.
25-27.
Growing on eel grass. Sitka, Alaska.
Setchell and Gardner, Phyc. Cont. VI, 1922, p. 408, pi. 47, figs.