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I9i2") i Setchell-Gardncr:
Melanophyceae 713
Anderson and Eaton, Alg. Exsicc. Amer. Bor., no. 102; Collins. Ilolden
and Setchell. Phyc. Bor.-Amer. (Exsicc), no. 537a (not 537&). Not
C. Agardh, Sp. I, 1820, p. 27. Not Yendo. Fucaceae Japan, 1907,
p. 54. Not Fwcus pilwlifer Turner, Fuci, vol. 1, 1808, p. 145, pi. 65.
Sargassum dissect ifoJium Setchell and Gardner, in Gardner, New Pac.
Coast Mar. Alg. I, 1917, p. 386.
2. Sargassum acinacifolium S. and G.
Basal parts unknown ; branches terete, smooth; leaves 12-16 mm.
long, asymmetrical, the upper margin concave and smooth, the lower
margin and apex coarsely dentate, ecostate, cryptostomata absent
vesicles situated at the base of the receptacles or more rarely among
the receptacles, subspherical, smooth, apiculate, 1.5-2.5 mm. diam., on
pedicels shorter than the diameter ; receptacles 2-3 times forked,
nearly cylindrical, not spiny, acuminate, more or less denticulate
toward the apices.
fig. 82.
Cast ashore, Guaymas ( ?), Mexico.
Setchell and Gardner, Mar. Alg. Gulf Calif., 1924, p. 732, pi. 21,
This species of Sargassum is a near relative, apparently, of S.
lapazeanum and of S. Bryantii, but it differs sufficiently in leaf,
bladder, and receptacle characters to warrant giving it separate
characterization.
3. Sargassum guardiense S. and G.
Basal parts unknown ; primary branches up to 5 dm. high ; second-
ary branches long and slender ;
branches and ramuli all smooth, terete
leaves slightly flattened, to filiform, ecostate, margins smooth, crypto-
stomata absent or rare ; vesicles situated at the base of the fructiferous
ramuli or among the branches of the receptacles, subspherical to
slightly cylindrical, 2-4 mm. long, smooth, tapering at both ends,
apiculate, on pedicels shorter than the diameter ;
; ;
receptacles 1-3 times
forked, terete, not spinose, 5-8 mm. long, forming with the vesicles
short heteroclyte cymes.
fig. 64.
Cast ashore at Angel de la Guardia Island, Gulf of California.
Setchell and Gardner, Mar. Alg. Gulf Calif., 1924, p. 732, pi. 19,
Unfortunately we have no complete specimens of this seemingly
very well defined species of Sargassum. The character of the holdfast