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704 University of California Publications in Botany [Vol. 8
Hesperophycus Harveyanus (Dec'ne) S. and G.
Frond 2-4 dm. high, dichotomous, usually one of the dichotomies
outgrowing the other, forming several main axes, some of the laterals
with several branches close together becoming flabellate; color dark
olive green, or yellowish brown when in exposed situations ; segments
5-10 mm. wide, with a row of cryptostomata extending longitudinally
on either side of the midrib, having an abundance of extruding para-
phrases ; receptacles simple but in part bifurcate, 1.5-3 cm. long,
cylindrical to ellipsoidal.
Growing on rocks in a restricted belt a few feet below high-tide
limit. The present known range is from Monterey Bay to Lower
California (Ensenada).
Setchell and Gardner, in Gardner, Nuclear Extrusion, 1910, p. 127,
pi. 16, figs. 8-10, New Fucaceae, 1913, pp. 317-320, pis. 36-37 ; Collins,
Holden and Setchell, Phyc. Bor.-Amer. (Exsicc), no. CXII. Fucus
Harveyanus Dec'ne, Voyage Venus, 1864, p. 9, Altas, 1846. pi. 4.
Fucus ceranoides f. Harveyanus Tilden, Amer. Alg. (Exsicc), no. 339.
family 25. SARGASSACEAE de-toni (lim. mut.)
Fronds differentiated into holdfast, stipe and more or less indis-
tinguishable from it the main rhachis of the frond which bears the
variously modified or differentiated branches arising on all sides of
the rhachis, and usually far surpassing it in length; stipe and main
rhachis perennial, the growing region at the apex of the rhachis some-
what obscure, primary branches fruiting, then disintegrating back to
the rhachis, leaving scars on the constantly elongating axis; oogonia
usually few and large ; receptacles small, cylindrical, or slightly
complanate, terminal or subterminal.
De-Toni, Syst. Uebers. Fucoid., 1891, p. 174.
Key to the Genera
1. Vesicles absent in our species 69. Blossevillea (p. 705)
1. Vesicles present 2
2. Vesicles single 73. Sargassum (p. 711)
2. Vesicles seriate 3
3. Stipe short in our species, merging into the hapteres . . . . 70. Cystophyllum (p. 706)
3. Stipe long, persistent 4
4. Stipe decidedly angular 72. Cystoseira (p. 70S)
4. Stipe terete, more or less geniculate 71. Halidrys (p. 707)