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of the Bay j abundant at Red Hook, after the July storm. A very beautiful plant, and is supposed to have 
escaped notice until the present season. 
No. 161. S. setacca. Robust below, capillary at apices; sub-dichotomous, 
branches thickly set, attenuated; stem and branches thickly set with short bristle 
like ramuli; joints very short, half to two-thirds the diameter. 
Summer, floating at the Battery, Red Hook, &c., sometimes attached to Zostera. Veiy raie. 
Genus, CALLITH AMMON. Lyngb. 
Rosy or brownish red, filiform, branches jointed, one tubed, mostly pinnate, dis¬ 
sepiments hyaline ; fructification, round or lobed receptacles on the main branches; 
also external tetraspores (antheridia 1) scattered along the ultimate branches, or 
borne on little stalks. The name is from two Greek words, and signifies a beautiful 
little shrub. 
No. 170. C. cruciatum. Ag. Linear, irregularly divided, articulated, each 
joint having 2 or 4 opposite or quarternate, slender, erect, pinnated ramuli. 
A rare plant. I found it floating at Red Hook in July, and subsequently I found it growing on a rock 
at Hurlgate, at low-water mark. \ 
No. 171. C. ligvator. Dull brown, distichous, fruit large, round, antheridia 
single and in clusters, the single are tulip shape, those in clusters have round knobs 
or capsules, joints 3 to 5 times longer than broad, pellucid dissepiments in branches 
sometimes very wide ; filiform, capillary, 1 to 3 inches high. 
Summer, between tide marks, on dock logs and other submerged wood ; first found by Mr. Walters, 
Jackson ferry slip. I found it in great abundance on the plank facings at Castle Garden, and subsequently 
very small plants, of microscopic growth, on many piers in the East River, and in Hudson River : for a short 
period I supposed this plant could not grow on any thing other than wood; later in the season, however, I 
found it on two dock stones at Caslle Garden ; the stones were covered with slime, and within three feet of 
the decaying wood facings to the outer wall. Though haunting the city docks, it requires clear water; when 
it locates near the terminus of a sewer, the growth is dwarf, from the fourth of an inch to microscopic length. 
The color of this little wood seeker, would seem to preclude its introduction into the society of Callithamnion, 
of Lyngb., but its general habits show strong claims to that rank. 
No. 173. C. roseum. Sm. Stems much branched, secondary branches long, 
flexuous, sub-distichously plumulate, with a roundish outline, and crowded towards 
the tips, pinnules long, spread, main articulations 4 to 5 times longer than broad ; 
those of the pinnae shorter, tetraspores (antheridia V) elliptical, scattered near the 
base of the pinnae. 
Summer and autumn, abundant on oyster shells and Algae, at half tide mark, in all parts of the Bay; 1 
to 2 inches high. 
No. 174. C. byssoidcum. Arnott. Stems extremely slender, flaccid, and bys- 
soid or a little stouter than cobweb, much divided, branches linear, lanceolate with 
pinnate plumules, joints of branches 8 times, of the ramuli four times longer than 
broad. 
Summer, at half tide, on shells, Zostera, and Algae—rather plenty—very delicate; must be lifted from 
the water with care, and carried carefully in salt water: antheridia single. 
