Ectocarpus confervoides Harv.

• Region

  North America

• Country

  United States of America

• State/Province

  California

• Locality

  Laguna Beach

• Coordinates

  33.5483, -117.777

• Coordinate Uncertainty (m)

  8201.57

• Georeferencing Method

  Georeferencing Quick Reference Guide, Version 2012. Located coordinates of geogr. center of Laguna Beach. Measured from coord. to farthest extent of the beach to find linear extent (8190 m). Input info. into MaNIS Georef. Calc. to find uncert. rad. (Bounded Area).

• Geodetic Datum

  WGS84

• Distribution

  Map all specimens of this taxon

Bctocarpus confervoides f. parvus (Saunders) Setchell & Gardner,
Univ.Calif .Pubi.Bot.7 :414. 16 My 192S. (comb.nov.)
NEW YORK
BOTANICAL
CARDEN
Fronds gregarious, forming tufted or extended
masses, 1-2 cm. high, more or less alternately branch-
ed; erect filaments 21-30 p. broad, slightly constrict-
ed at the joints, much attenuated at the tips or end-
ing in hairs; cells 1-3 times as long as broad below,
shorter above; chromatophores irragularly band-shaped;
zoosporangia ovoid or ellipsoid, 35-55 u long, 20-27 u
broad, usually sessile, sometimes on the same filamenl
with the gametangia; gametangia narrowly lanceolate-
conical, gradually long-attenuated above, 120-400 u
long, 20-27 ji broad, borne on a longer or shorter pedi-
cel, occasionally seriate and intercalary (as in Pylaiella),
On sand-covered rocks,(type I), logs, or on the larger
Melanophyceae. Central California (near San Francisco) and
southern California (San Pedro, the type locality, and San
Diego).
Bctocarpus siliculosus parvus Saunders, Phyc. Mem.,
1898, p. 153, pi.22, figs. 1-9.
ihe f. parvus, as defined above, presents certain
resemblances to both Bctocarpus siliculosus and B. con-
fervoides. Its slender elongated gametangia resemble
those of B. siliculosus and much might be said in favor
of the opinion of Saunders in making it a M variety "
of that species. On the other hand, very few, or none,
of the typical gametangia end in a hair and we have
therefore preferred to place it rather with B. confer-
voides. There are often found in this form, as well
as in forms of B. siliculosis, very curious, elongated,
intercalary gametangia which seem to be seriate in that
they open laterally in sections, as do those of Pylaiella.
Such gametangia are very puzzling, but may possibly be
regarded as indicating hybridization between Pylaiella and
Bctocarpus or a mutation of some sort. Speculation, how-
ever, can scarcely explain such anomalies. The majority
of the gametangia are typically of Bctocarpus and while
approaching in shape those of E. siliculosus, are less
slender and less elongated than is typical for that spec-
ies and are not ordinarily prolonged into terminal hairs.
So far as we may judge from the scanty specimen in
our copy, no. 358 of Tilden's American Algae (from Pacific
Grove) belongs rather under f. parvus than f. variabilis,
although the determination as f. variabilis, is attributed
to Saunders.
Herbarium of
NEW YORK
distributed from
THE HERBARIUM OF
G. J. HOLLENBERO
GEORGE J. HOLLENBERcf °TANICAL
il,
GARDEN
is confervoidñ,q( Rnt.h )
f» parvus (Saund. )S.&drJ.e Jolls
Laguna Beach
Date 3/20/
Coll. 'j • J • H .
OîTlI Iji County
-Lj OY,’ 1 Jl tj t OTcl ¿one
No. 1302
if
/JO 2.
Eg foearûw;
conj-evu©»<ies
G Ï -f+
Ecfc&carpus confervoides f. parvus (Saunders) S. and G. lj~l3
Fronds gregarious, forming tufted or extended masses, 1-2 cm.
high, more or less alternately branched ; erect filaments 21-30/x broad,
slightly constricted at the joints, much attenuated at the tips or end-
ing in hairs; cells 1—3 times as long as broad below, shorter above;
chromatophores irregularly band-shaped ; zoosporangia ovoid or ellips-
oid, 35-55/a long, 20-27/j. broad, usually sessile, sometimes on the same
filament with the gametangia; gametangia narowly lanceolate-conical,
gradually long-attenuate above, 120 400ft long, 20 27/x broad, born®
on a longer or shorter pedicel, OfiM&ionally seriate and intercalary
(as in Pylaiella)..
On sand-covered rocks	logs, or on the larger Melano-
phyceae. sjigntral €Js3ifornia pip* San ¡¡feteAe®) and southern
California (San Pedro and the type locality, San Diego).
Setehel) and Gardner, Phyc. Oont. 1922, p. 414. Ectocarpus
siliculosus parvus Saunders, Phyc. Mem. .1898, p. 153, pi. 21, figs. M*
The il -parvus, defined above, prestós certain resemblances to
both Ectocarpus siliculosus and E. confervoides. Its slender elongated
gametangia resemble thtS# of E, s&iculosvs and much might be said
in favor of the opinion of Sasnderf in, making if a ‘ ‘ variety ’ ’ of that
species. On the other hand, very few, or none, of the typical game-
tangia end in a hair and we have therefore preferred rather t-o place
it with E. c(Mf:0rvoià0s* There are often found in this form, as well
as in forms of E. sUiculosus, very curious elongated intercalary game-
tangia which seem to be seriate, in that they open laterally in sections,
as do those of Pylaiella. Such gametangia are very puzzling, but
may possibly be regarded as indicating hybridization between Pylai-
ella and Ectocarpus or a mutation of some sort. Speculation, how-
ever, can scarcely explain such anomalies. The majority of the game-
414
University of California Publications in Botany [Vol. 8