Ectocarpus acuminatus D.A.Saunders

• Region

  North America

• Country

  United States of America

• State/Province

  California

• County/Municipio

  Monterey Co.

• Locality

  Pacific Grove

• Coordinates

  36.6177, -121.917

• Coordinate Uncertainty (m)

  2709

• Distribution

  Map all specimens of this taxon

7. Ectocarpus aeuminatus, sp, nov. Saunders. Proc. Calif.
Acad. Sci. Hi; Bot. TTTT4V.' "pi. 14, Figs. 1-5. 1898

Plant minute; creeping filaments forming a* compact net"
work; erect filaments simple, of the same size from base to apex,
a mm. or so high; cells not at all constricted, 12-14u broad, be-
low as long as the diameter, above 2-3-5 times as long; chroma-
tophores elliptical, much more abundant in the central part of the
filament; plurilocular sporangia sessile on the base of the erect
filaments orarising on a long or short stalk from the creeping fil-
aments, lanceolate, very long-acuminate, sometimes tipped with a
short hair, often more or less curved, 90-300u (rarely 400u) x 20-
30u.

Forms minute, light brown tufts in the conceptacles
of Cystoseira osmundacea. Pacific Grove, California, July, 1896;
San Pedro, California, Aug., 1896.

The creeping filaments ramify through between the para-
physes and attach themselves to the inner wall of the conceptacle;
the erect filaments extend out of the mouth of the conceptacle a
mm. or so; the plurilocular sporangia point toward the opening or
extend just out of it.

Pro c . CaiAcad.5 ci. 311 Ser. B dt.Yg l I.

[Saunders] Plate XIV

new y°*h

jOTANZi

PLATE XIV.

Figs. 1-5. Ectocarpus aeuminatus, sp. nov.

Figs. 1 and 2 x 80; 3-5 x 450.

-5. ECTDCARPUB ACÜMINATU5, SP. NOV.	X\K

Q* N TYPE OF:

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NEW YORK BOTANICAL GARDEN

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Setcheli, W. A. & Osràner, N. L. Melanophyceae
Univ. Calif. Pubi. Bot. 8: 435, 1925

Pliycotheca Boreali-Americana. Collins, Holden, and Setckell.

524. Ectocarpus aeuminatus Saunders.

Saunders, Proc. Calif. Acad., 3d series, Vol. I, p. 149, PI. XIV, figs.
1-5, 1898.

Forming minute light brown tufts on the conceptacles of Cysto-
seira osmundacea, often associated with E. cylindraceus. Pacific
Grove, California, August, 1896.

De A. SAUNDERS.

With plurilocular sporangia.

NEW YORK BOTANICAL GARDEN

		
0	0887755	

i • ^27. Ectocarpus aeuminatus Saunders

Fronds diminutive, attached by a network of delicate rhizoidal
filaments; erect filaments uniform in size throughout, 1-2 mm. long;
cells cylindrical, not constricted, 12-14n diam., quadrate below, 2-5
times as long above; chromatophores irregular or elliptical disks, more
abundant in the central part of the filament than elsewhere; zoo-
sporangia unknown; gametangia sessile on the creeping filaments or
on the base of the erect filaments or terminal on short filaments arising
directly from the creeping filaments, very long-acuminate, sometimes
tipped with a short hair, often more or less curved, 90-300/x long,
20-30/x broad.

Growing within the conceptacles of Cystoseira osmundacea and
Halidrys dioica. Central California (Pacific Grove) to southern

California (San Pedro).

Saunders, Phyc. Mem., 1898, p. 149, pi. 14, figs. 1-5; Collins,
Holden and Setchell, Phyc. Bor.-Amer. (Exsicc.), nos. 524 and 2142.

The shape of the gametangia would seem to ally this very incon-
spicuous species most closely with E. stticulosus, but the chromato-
phores are described by Saunders as elliptical. We have only dried
material for examination and cannot, therefore, add anything to the
description by Saunders. It is a very curious and seemingly distinct
species. Its habitat, within the conceptacles of members of the
Fucaceae, seems to have reduced it almost to the state of parasitism,
at least one-half of the plant being unable to function in food making.

00887755