Download PDF

714 University of California Publications in Botany [Vol.8
and of the main stipe, which are in many instances of much value in
classification, cannot be stated. We have several clean primary
branches which are in good fruiting condition and otherwise seem-
ingly characteristic. The loose, open character of the branching and
the shape and size of the vesicles remind one very much of some mem-
bers of the genus Cystophyllum J. Ag. It has perhaps its nearest
relative in 8. carpophyllum but differs in leaf characters and in the
vesicles being regularly lateral or terminal to the receptacles.
4. Sargassum lapazeanum S. and G.
Fronds 4.5-6 dm. high, arising from a solid parenchymatous disk;
stipe 1.5 cm. long ; primary branches 5-7, terete, smooth, giving rise
to numerous long, slender, secondary branches ; leaves 0.5-1.5 cm.
long, asymmetrical, widest toward the apices, with very short petioles,
the basal half of the upper margin smooth and concave, the remainder
of the blade sharply dentate, midrib inconspicuous, cryptostomata
abundant and conspicuous; vesicles scattered among the receptacles,
ellipsoidal, 1-2 mm. long, transformed from the base of a leaf, mostly
crowned by the remnants of the blade ; receptacles 4-7 mm. long, 2-3
times forked, branches strict, spinulose, intermixed with leaves and
receptacles forming a heteroclyte cyme.
fig. 74.
Cast ashore, La Paz, Lower California.
Setchell and Gardner, Mar. Alg. Gulf Calif., 1924, p. 733, pi. 20,
5. Sargassum Bryantii S. and G.
Basal parts unknown ; branches terete, more or less contorted
leaves 6-12 mm. long, 0.5 as broad as long, ecostate, asymmetrical, the
upper margin concave and smooth, the lower margin and the end
unevenly serrate ; cryptostomata few and irregularly placed ; vesicles
numerous along the ramuli or, more rarely, intermixed with the
receptacles, subspherical, marginate wdien young, spinose, short- petio-
late ; receptacles short, 4-8 mm. long, 1.5-3 mm. broad, irregular
cylindrical below, blunt or pointed, at times slightly spinose and
crowned with a rudiment of a leaf.
fig. 83.
Cast ashore near La Paz, Lower California.
Setchell and Gardner, Mar. Alg. Gulf Calif., 1924, p. 733, pi. 21,
The characters of the receptacles do not agree in every particular
with those given by J. Agardh (Sp. Sargas. Austral.) in his key to
;