MARINE ALG OF BEAUFORT, N. C. 513 
Fronds moderately robust, terete, 4 to 25 cm. tall, about 1 mm. in diameter below, tapering toward 
the apices, branching radial, cortex continuous almost to the apices of the branches; branches some- 
times recurved, hairlike branchlets more or less abundant, especially over the upper parts of the 
branches, about 0.5 to 1.5 mm. long, naked, except at the nodes, where they are surrounded by a 
ring of cortical cells, simple and acuminate at the apices; segments of the branches about equal to the 
diameter in length or somewhat longer, those of the hair branchlets 2 to 4 diameters long; tetrasporangia 
borne singly or two to three together at the nodes of the hairlike branchlets; cystocarps two to three 
lobed, terminal on short, lateral branches; texture flaccid or slightly rigid and brittle; color purplish 
pink. 
Warm and temperate waters generally. 
Small fragments in tide pool on ‘Town Marsh,’’ Beaufort, N. C., September, 1905, two large 
masses on Bogue Beach, October, 1905, large, battered specimens in tide pool (“Mullet Pond’’) on 
Shackleford Banks, August, 1907, few plants dredged from coral reef offshore, August, r914 and rors. 
Abundant on Zostera marina in Pamlico Sound, o to 30 cm. below low water, August, 1907, Ocracoke, 
N.C. Few specimens on beach, August, 1909, Georgetown, S. C. 
This species is distinguished from the following one by absence of the club-shaped branches and 
by the numerous fine, hairlike branchlets scattered over the frond and usually abundant on the younger 
parts of the branches. It is variable in appearance, but good specimens are usually easily recognized. 
It is not likely to be mistaken for any other species in this region. 
2. Spyridia clavata Kuetzing. 
Spyridia clavata, Kuetzing, 1841, p. 744. 
Spyridia clavata, De Toni, 1903, p. 1435. 
Fronds slender or moderately robust, rather terete below, flattened above, 8 to 20 cm. long, about 
1 to 2mm. wide, branching distichous, usually alternate, sometimes opposite, larger and smaller branches 
intermixed, cortex continuous to the apices of the branches; smaller branches tapering toward the 
bases, larger toward the apices, markedly club shaped, about 2 to 4.5 mm. long, apices acuminate or 
obtuse; very fine, hairlike branchlets present, but not very conspicuous, naked, except at the nodes, 
where they are surrounded by a ring of cortical cells, simple and acuminate at the apices; texture 
gelatinous-cartilaginous, somewhat rigid; color light pink with tinge of green or straw. 
North Carolina; West Indies; Senegambia. 
Several plants dredged from coral reef offshore, Beaufort, N. C., August, 1914. 
This species is distinguished from the preceding by its markedly club-shaped, small branches 
and by the flattening present in the upper part of the frond. It sometimes resembles, in its gross appear- 
ance, Chondria tenuissima, but is easily distinguished from this by its evident segments showing through 
the cortex, resembling in this respect Ceramium rubrum. 
This is the northern known limit of the species. 
Genus 5. Ceramium Agardh. 
Ceramium, Agardh, 1817, p. XX VI. 
Frond erect, terete, slender, of moderate size, branching profuse, regularly dichoto- 
mous with forcipate apices, and bearing in addition more or less numerous lateral 
branches; structure cellular, with a central axis composed of a row of large cells and 
surrounded at the nodes or throughout by a more or less dense cortex whose cells become 
smaller toward the surface, sometimes beset with spinelike hairs; tetrasporangia formed 
from cortical cells at the nodes, naked or inclosed, often becoming prominent and pro- 
truding, occurring singly or several together, sometimes forming a single or double circle 
surrounding the node, triangularly divided; antheridia forming more or less expanded 
irregular patches over the surface of the cortex on smaller branches; procarps occurring 
in small numbers on the outer side of the upper dichotomies, bearing two carpogonia; 
cystocarps lateral, sessile at the nodes, toward the apices of the branches, sometiines 
appearing almost terminal, surrounded by several short, incurved branchlets, contain- 
