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424 University of California Publications in Botany [Vol. 8
13. Ectocarpus commensalis S. and G.
Fronds 200-400/*. high, densely fasciculate, attached by inter-
twined, slightly branched rhizoids penetrating among the utricles and
even well among the medullary filaments of the host ;
erect filaments
alternately branched near the base, simple above, slightly attenuated
upward, not piliferous; cells of the erect filaments cylindrical, not
constricted, 12-18/* diameter at the base of the filaments, 1.5-2.5 times
as long as the diameter ; chromatophores band-shaped, few in each
cell ; zoosporangia unknown gametangia blunt-fusiform to cylindrico-
;
conical, short-pedicellate, mostly lateral near the base of the filaments,
rarely terminal, 60-100/* long, 15-20/* wide.
Growing on Codium Setchellii Gardner, Carmel Bay, and on
Codium fragile (Suring.) Hariot, Pacific Grove, Monterey County,
California.
32-35.
Setchell and Gardner, Phyc. Cont. VI, 1922, p. 407, pi. 48, figs.
This minute species of Ectocarpus is one of several occurring on
species of Codium, both on this coast and on that of southwestern
Europe. The colorless rhizoidal filaments descend into the substance
of the host even to the central (or basal) medullary tissues. The
smaller diameter of the erect filaments and the more narrowly conical
or fusiform gametangia readily distinguish this species from the
others.
14. Ectocarpus eramosus S. and G.
Fronds diffused or in diminutive tufts, 1-3 mm. high, attached by
irregularly branched rhizoidal filaments penetrating deeply among the
utricles of the host; erect filaments eramose or rarely producing short,
divergent branches usually terminated in gametangia, slightly atten-
uated toward the base and the apex, not piliferous; cells of mature
filaments 28-40/* diam., 0.5-1.25 times as long as the diameter, cylin-
drical, very slightly constricted; chromatophores relatively thick,
closely crowded, irregular bands without pyrenoids; zoosporangia
unknown; gametangia very variable in shape and size, lateral and
alternate along the entire filament or occasionally terminal arid seriate
on the main filaments, mostly on few-celled pedicels, lateral forms
cylindrical to cylindrico-conical, 150-230/* long, 26-36/* diam., ter-
minal, seriate forms, 700-900/* long, 15-20/* broad.