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1925] Setchell-Gardner: Melanophycecu 415
On larger Melanophyceae (Drsmarestia and the Laminariaceae).
Pugel Sound to central California (Carmel).
Saunders, Phyc. Mem.. 1898, p. 155, pi. 23; Setehell and Gardner,
Alg. N.W. Amer., 1903, p. 238 (at Least in part). Ectocarpus con-
fervoides f. nanus Collins, Holden and Setehell, Phyc. Bor.-Amer.
(Exsicc). no. 1737 (not of Kuckuck).
Saunders founded his f. variabilis on a plant common along the
coast from Puget Sound to central California. He named it, how-
ever, for the variable structures which he considered to be zoospor-
angia. but which are, most probably, undeveloped (parasitized or
abortive !) gametangia such as Sauvageau (1896a, pp. 41-45) has
shown to exist in Ectocarpus oonfervoides and other species of Europe.
The form, however, seems otherwise distinct and is fairly readily
recognized by the characters given above and indicated in the key to
the forms of E. confervoides.
Ectocarpus confervoides f. pygmaeus (Aresch.) Kjellm.
Fronds forming a more or less extended layer, 1-12 mm. (mostly
1-3 mm.) high, unbranched, or slightly so, above, branches only
slightly tapering at the apices; erect filaments 12-25/x diam., not
constricted at the joints, cells 2-3 times as long as the diameter below,
shorter above; chromatophores few, irregularly band-shaped; zoo-
sporangia uncertain ; gametangia terminal or lateral on the erect
filaments, sessile or on short pedicels and often abundant on the creep-
ing filaments, broadly conical or fusiform, abruptly narrowed at the
apex, 60-100/* long, 20-30/x broad.
On various larger Melanophyceae. Alaska (Shumagin Islands)
to central California (Pacific Grove).
Kjellman. Handb., I, 1890, p. 77; Saunders, Phyc. Mem., 1898,
p. 154, pi. 15, figs. 5-9; Collins, Holden and Setehell, Phyc. Bor.-Amer.
(Exsicc), no. 525. Ectocarpus tcrminalis Collins, Holden and
Setehell, Phyc. Bor.-Amer. (Exsicc), no. 1387. Ectocarpus confer-
voides variabilis Tilden, Amer. Alg. (Exsicc), no. 358. Ectocarpus
pygmat us Areschoug, iu Kjellman, Skand. Ectocarp., 1872, p. ^~->.
3. Ectocarpus acutus S. and G.
Fronds 5-9 cm. high, dark brown when dried, olive green when
living, feathery; erect filaments more or less entangled and fasciculate
below, free above, profusely branched, main filaments densely cor-
ticated; branches mostly alternate, strict; ultimate ramuli often