164 
CALIFORNIA. 
[Algm. 
A very remarkable variety, with a stipitate frond, cartilaginous below, branched ; branches or segments 
oblong, wedge-shaped, inclining to palmate, strongly nerved at the base : the nerve ramifying over the whole 
membrane, and visible to the extremity of the frond. In some specimens these segments are stipitate, and 
almost resemble the leaves of a Delesseria. Sori in marginal leaflets. — S. serrulatum. Harv. — Frond linear, 
attenuated, much branched, with a broad nerve at the base, which vanishes about the middle, the margins 
sharply serrate. 
1. Rhodomenia laciniata. Grev. — Fucus laciniatus. Turn. t. 69. 
2. Rhodomenia polycarpa. Grev. — Crypt, t. 352. 
Another specimen in the Herbarium probably belongs to this species also. 
3. Rhodomenia ciliata; /3. micropliylla. 
A remarkable variety, with a lanceolate outline, throwing out stipitate lanceolate leaflets from its margine 
and disk; these in turn are ciliato-dentate, with lanceolate compressed ciliae, or incipient tertiary leaflets on 
both surfaces. 
1. Gelidium cartilaginewn. Gaill. — Fucus cartilagineus. Turn. t. 124. 
2. Gelidium corniculatum. Grev. — Fucus corniculatus. Turn. t. 182. 
3. Gelidium? lanceolatum. Harv. MSS. Fronde plana cartilaginea bipinnata, pinnis 
elongatis basi attenuatis, pinnulis lanceolatis simplicibus suboppositis. 
6-8 inches high, pinnately branched, the branches (pinnae) long, simple, much attenuated at the base and 
apex ; 1-2 lines broad in the middle, pinnated with foliaceous, lanceolate, mostly opposite ramuli, from 2-6 
lines long. Both branches and ramuli are perfectly simple, and preserve their strictly lanceolate figure 
throughout. 
1. Plocamium ccccineum. Lyngh. — Fucus coccineus. Turn. t. 59. 
1. Laurencia ohtusa. Lamour. — Fucus obtusus. Turn. t. 2\. 
2. Laurencia Lamour. — Fucus pinnatifidus. Turn. t. 20. 
1. Chondrus mammillosus. Grev. — Fucus mammillosus. Turn. t. 218. 
2. Chondrus constrictus. Grev. — Fucus constrictus. Turn. t. 152. 
3. Chondrus vermicularis. Grev. {?) — Fucus vermicularis. Turn. t. 221. (?) 
The specimen which I refer to this species wants the fniit, which in the Chondri is of some moment in 
specific characters, but the ramification and substance agree with Turner’s figure. 
1. Ptilota hypnoides. Harv. MSS.; jugamento compresso filiformi bipinnato, pinnis 
pinnulisque alternis, his alternatim pinnatifidis (segmentis lanceolatis) et ramidis foliifor- 
mibus lanceolatis acutis altei’nantibus. 
This, not excepting our own P. plumosa, is the most beautiful of the genus, and one of the most elegant 
of marine plants. It is readily known by the small leaflike ramuli, ( 1 line long) of a lanceolate figure, which 
regularly alternate with the pinnules, a pinnule and a leaflet being always opposite each other, but standing 
alternately on the stem. Stems bipinnate, 4-5 inches high, slender, two-edged, aU the divisions alternate ; 
pinnules closely pinnated with lanceolate leaf- like ramuli, between each of which rises a rudimentary branchlet, 
which in its turn bears also a set of similar little leaves, in an alternate series, opposite each of which is a 
clavate dark red receptacle full of small grains. 
