Sargassum polyacanthum f. americanum Setch. & N.L.Gardner

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Herbarium of the University of California

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Sargassum polyacanthum f. americanum Setchell & Gardner, f.nov.
Proc.Galif.Acad.3ci.lv. 12: 736. 13 My 1924.

Basal parts unknown; branches and branchlets
up to 1.5 mm.diameter, moderately muricate; leaves
3-4 cm. long, narrowly lanceolate, acute, margins
serrate-dentate, midrib percurrent, cryptostomata
sparse; vesicles spherical, smooth, up to 8 mm.
diameter, occupying positions of leaves along the
ramuli or at times supported by a leaf; receptacles
1-2 times forked, 2.5-4 mm. long, obtuse-conical.

Cast ashore, La Paz;(?), Lower California.
Type, Brandegee, no. 27.

This species stands very close to S.
spinuligerum Sond. The leaves are longer and
narrower than in that species. There are also
other specific differences.

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00922445