Ectocarpus siliculosus (Dillwyn) Lyngb.

• Region

  North America

• Country

  United States of America

• State/Province

  Alaska

• County/Municipio

  Aleutians West Census Area

• Locality

  Unalaska, on stipes of Alaria fistulosa

• Coordinates

  53.8845, -166.533

• Coordinate Uncertainty (m)

  19251.6

• Georeferencing Method

  Georeferencing Quick Reference Guide, Version 2012. Located coordinates of geogr. center of Unalaska. Measured from coord. to farthest extent of the city to find linear extent (19240 m). Used MaNIS Georef. Calculator to find uncertainty (Bounded Area).

• Geodetic Datum

  WGS84

• Distribution

  Map all specimens of this taxon

1925]	Setchell-Gardner: Melanophyceae	421
9. Ectocarpus terminalis Kuetz;.
Fronds 0.75-2 (or 4) mm. high, mostly forming a continuous
velvety layer, brownish in color,* creeping filaments irregular,
branched, anastomosing and forming, at times, a partially pseudo-
parenchymatous layer; erect filaments simple or sparingly branched,
more or less attenuated above; cells of creeping filaments 8—24^, long,
10-18/t broad; cells of erect filaments cylindrical, 8-12/x broad, up to
six times as long; chromatophores short, band-shaped, few in each
cell; zoosporangia terminal, ellipsoidal, 26-S%i long, 20-30//. broad;
gametangia ovoid or ovoid-oblong, often curved, terminal, or lateral
and sessile or short-stalked, 48-120ft long, 16 -32/*, broad.
On larger Melanophyceae. Alaska (Unalaska) to southern Cali-
fornia (Laguna).
Kuetzing, Phyc, Germ., 1845, p. 236, Tab. Phyc., vol. 5, 1855, pi.
74, fig. Ill; Kjellman, Skand. Ectocarp., 1872, p. 54, pi. 2, figs. 7a, 7b;
Setchell and Gardner, Alg. N.W. Amer., 1903, p. 237; Collins, Holden
and Setchell, Phyc; Bor.-Amer. (Exsicc.), no. 1034 (in part) (not
no. 1387).
We have accepted Kjellman’s interpretation of Kuetzing’s Ecto-
carpus terminalis and refer here, although not without some hesita-
tion, no. 1034 of the Phycotheca Boreali-Americana found growing
on stipes of Alaria fistulosa in Unalaska Bay. There is intermingled
in bur specimens, however, a plant which seems to be a form of
Ectocarpus confervoides. We have also referred here a plant found
growing on Fucus at Fort Ross, California.
The creeping filaments in this species anastomose more or less and
in some parts of the specimens form almost a parenchymatous basal
layer, strongly resembling that of the species of the Myrionemataceae.
Nearly every cell of the prostrate filaments gives off an erect filament,
a condition characteristic among the Myrionemataceae, but not gen-
eral among the Ectocarpaceae. The erect filaments are slender, with
rather long cylindrical cells, and bear terminal zoosporangia and either
terminal or lateral,, sessile or short-stalked, gametangia. The chroma-
tophores are clearly band-shaped though short. No. 1387 of the
Phycotheca Boreali-Americana seems to be entirely made up of a
form of Ectoca/rpus confervoides.
Hatfield Marine Science Center
OREGON STATE UNIVERSITY
AKSurvey# t&fa *¥Wi
Annotated by: G. Hansen
Date: 9/9/99
Phycotheoa Boreali-Americana.
Collins, Holden and Setohell.
1034. Ectocarpus terminalis
Kuetzing, Phyc. Germ., p.	YORK botanical Garde
De Toni, Syll. Alg., Vol. Ill, p. 538,U BmTTON- ,S22
Collins, Bull. Torrey Bot. Club, Yol. XV, p. 311, 1888.
Collins, Holden & Setchell, Phyo. Bor.-Am., No. 12% 1895.
Setchell & Gardner, Algae of N. W. America, Univ. of Calif.
Publications, Bot., Yol. I, p. 237, 1908.
On stipes of Alaria fistulosa, Unalaska, Alaska, June-Aug.,
1899.
W. A. SETCHELL & A. A. LAWSON.
The same species, from Rhode Island, was distributed as No.
126 of the ptesent work.
I
Setehell, W. A .St Gardner, N. L. Melanophyceae
Univ. 6alIf• Pubi. lot. 8: 421, 1925
02233603