498 BULLETIN OF THE BUREAU OF FISHERIES. 
Var. gemmifera (Harvey) J. Agardh. Pl. CVI, fig. 2. 
Laurencia gemmifera, Harvey, 1853, p. 73, pl. 18 B. 
Laurencia tuberculosa var. gemmijera, J. Agardh, 1876, p. 657. 
Laurencia tuberculosa var. gemmifera, De Toni, 1903, p. 802. 
P. B.-A. No. 141. 
Frond terete, branching profuse, alternate, irregular, decompound, forming more or less intricate 
tufts, branches spreading, bearing numerous short, simple, blunt, tubercular branchlets on all sides, longer 
and shorter branches intermingled without order; texture cartilaginous and brittle; color light red or 
yellowish, sometimes greenish. 
Florida and West Indies. 
Abundant on Bogue Beach and floating in harbor, Beaufort, N. C., August to October, 1905 (few 
plants tetrasporic), few small masses unattached on bottom near ‘‘Green Rock”? in Newport River, 
August, 1906, occasional on Bogue Beach, September, 1906, one large plant (male) on Shackleford jetty 
about 30 cm. below low water, August, 1907. 
The specimens from this locality do not resemble authentic specimens of L. tuberculosa, but closely 
resemble a specimen from Key West labeled ‘‘L. gemmifera”’ by Harvey. In herbaria the variety 
passes over into the species, but in this region the plants are quite uniform, with little variation, and 
are always light to dark green. They will not be mistaken for any other species occurring at Beaufort, 
being easily distinguished by the richly and irregularly branched, intricate tufts of stiff, brittle, carti- 
laginous, dull green fronds bearing numerous short, blunt, tubercular branchlets on all sides. 
This is the northern known limit of the species and of the genus. 
Besides the above species, there were collected on Bogue Beach in August, 1906, 
several battered specimens evidently belonging to another species of Laurencia. These 
somewhat resemble a battered specimen of L. pinnatifida (Gmel.) Lamour., but are 
indeterminable. 
Genus 2. Chondria (Agardh) Harvey. 
Chondria, Agardh, 1817, p. XVIII. 
Chondria, Harvey, 1853, p. 19. 
Chondriopsis, Farlow, 1882, p. 165. 
Frond erect, terete or somewhat flattened, richly branched, branches arising radi- 
ally or pinnately, usually alternately, virgate, ‘bearing branchlets which are markedly 
constricted at their bases; structure cellular, with a single circle of five loose pericentral 
cells surrounded by several layers of smaller cells within the surface and one or more 
layers of small cortical cells, growing points prolonged or sunk in slight apical depres- 
sions, apical cell transversely divided, trichoblasts somewhat persistent, but finally 
evanescent; tetrasporangia usually numerous, occurring without conspicuous order 
among the subcortical cells toward the middle or upper parts of spindle-shaped ultimate 
branchlets, formed from segments of the pericentral cells, triangularly divided; an- 
theridia irregularly oval, sometimes crumpled plates attached by short stalks to tricho- 
blasts on ultimate branchlets, bordered by one or more rows of sterile cells (fig. 39); 
cystcarps numerous, sessile on the ultimate branchlets, prominent, ovate, pericarp 
thick, opening by an apical pore, gonimoblast composed of branched filaments radi- 
ating from a basal placenta, bearing single large, elongated, pear-shaped carpospores 
in their terminal segments; tetrasporangia, antheridia, and cystocarps borne on separate 
plants 
About 25 species, often separated by variable characters and exceedingly difficult 
to determine, in warm and temperate seas. 
