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I_(i University of California Publications in Botany [Vol.8
cavities of the injured cells. Its prostrate filaments and the lower
portions of the erect filaments have moniliform, almost globular, cells
which; together with rhizoidal filaments issuing from the very ba.sal
ones, while perfectly separate, form a thin layer or cushion, with
something of the appearance of that of Elachistea.
Our specimens seem to agree so closely with the figures and descrip-
tion of Sauvageau and to grow under such almost identical conditions,
that we must necessarily refer them to this species. Thus far it has
been detected only at Lands End, San Francisco, California, and
only on one occasion. Our specimens show zoosporangia (not hitherto
described) as well as gametangia.
16. Ectocarpus granulosus (Eng. Bot.) Ag.
Fronds tufted, rather coarse and rigid, 1-8 cm. (up to 16 cm.)
high, profusely branched ; primary branches opposite or whorled,
mostly corticated below ; secondary branches opposite or at times
alternate, short, tapering upward, often recurved at the tip, ending
in hairs ; ultimate ramuli secund, short, acute, ending in short hairs
cells of the main filaments 80-100/x diam., quadrate or shorter than
the diameter, constricted at the cross-walls; chromatophores small,
regular disks; zoosporangia "sessile, globose"; gametangia sessile,
broadly ovoid, asymmetrical, mostly secund on the terminal ami
subterminal ramuli, 60-100/x long, 30-6G> broad.
Growing on various other algae and on stones in the lower littoral
belt. Washington (Puget Sound) to southern California (San Pedro).
Agardh, Sp. Alg., vol. 2, 1828, p. 45; Saunders, Phyc. Mem. 1898,
p. 156, pi. 24, figs. 3-5 ; Setchell and Gardner, Alg. N.W. Amer., 1903,
p. 238; Collins, Holden and Setchell, Phyc. Bor.-Amer. (Exsicc),
no. 1589. Ectocarpus granulosus f. corticulatus Collins, in Collins,
Holden and Setchell, Phyc. Bor.-Amer. (Exsicc), no. 1590. Conferva
granulosa English Botany, 1814, pi. 2351.
Ectocarpus granulosus was discovered by W. Borrer in the vicinity
of Brighthelmston (Brighton), East Sussex, England, and is now
reported from many coasts of Europe and both eastern and western
North America. There is considerable variation, especially as regards
dimensions both of the primary branches and of the gametangia. In
some of our specimens, the gametangia reach a length of 165^, and
a breadth of 65^, but the majority are 90-1 10ft long and 50-60/* broad.
We have not seen zoosporangia in any of our specimens. The very
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