Download PDF

710 University of California Publications in Botany [Vol. 8
2. Cystoseira Setchellii Gardner
Stipe developing from an irregularly conical-shaped solid base,
flexible, cartilaginous, irregularly and sparingly forked, 2-3 dm. long,
8-10 mm. diam., triangular in cross-section, giving rise to numerous,
alternate, flattened branches at short intervals, always from just below
the growing point ; flattened branches coriaceous, annual, deciduous,
thus producing prominent scars on the stipe, serrated at the base,
deeply and pinnately lobed or divided in the middle, 3-4 times pin-
nately divided into filiform ramuli at the apex ; the pinnate segments
often in turn becoming serrated, lobed, and divided ; color of the
living plant dark brown, turning black when dry ; receptacles terminal
on the ramuli, 15-25 mm. long ; vesicles 1-3 seriate, terminal one fre-
quently mucronate, spherical, containing internal, longitudinal, white
fibers, without a margin, 6-8 mm. diam., situated at the base of the
serrated segments, or at the base of the filiform branches ;
whole plant
6-8 dm. long; perennial; dioecious, the two sexes being very similar
in external appearance.
Growing in the sublittoral belt. San Pedro and Redondo, southern
California.
Gardner, New Fucaceae, 1913, p. 329, pis. 47-50. Cystoseira osmun-
dacea, Collins, Holden and Setchell, Phyc. Bor.-Amer. (Exsicc), no.
CXVb.
3. Cystoseira neglecta S. and G.
Stipe arising from an irregular, conical-shaped, somewhat fibrous
holdfast, flexible, rather sparingly forked, 5-15 cm. long, 4-6 mm.
diam., triangular in cross-section, giving rise to flattened branches
alternately arranged just below the terminal growing point ;
flattened
branches coriaceous, flexible, becoming rigid and brittle when dry.
dying back after fruiting, leaving a permanent angular scar on the
stipe, when young divided into rounded alternate lobes by a deep
sinus rounded at the base ; the lobes of the lower and middle portion'
of the branches becoming 2-3 times pinnatified, and the upper lobes
becoming repeatedly divided into cylindrical branches terminating in
numerous receptacles; air vesicles developing on separate filiform
branches, solitary or few in a series but separated 1-3 mm. from
each other, spherical, smooth, 2-3 mm. diam., whole plant 4-7 dm.
long; color of living plant light brown, turning black when dry;
perennial ; dioecious.