MARINE ALGA! OF BEAUFORT, N. C. 503 
Fronds forming erect tufts, 1 to 8 cm. tall, arising from creeping filaments, somewhat setaceous 
below, capillary above, soft and flaccid, branching somewhat dichotomous, irregular, decompound, with 
many lateral branches, branches distant, divided into fine branchlets and more or less densely tufted 
toward apices, sometimes tufted throughout, secondary branches very slender, branchlets usually 
elongated, tapering; pericentral cells 4, segments 1.5 diameters long below, 2 to 3 diameters in small 
branches, 3 to 5 diameters in large branches, less than 1 diameter in branchlets, no cortex; tetrasporangia 
scattered, usually occurring singly, sometimes in pairs, in swollen portions of branchlets; cystocarps 
small, ovate on upper branches; color light yellowish red to dark brownish red. 
Florida; West Indies. 
About 10 specimens, Bogue Beach, Beaufort, N. C., February, 1909. 
This species may be distinguished from P. harveyi, the only other species with four pericentral cells 
thus far found at Beaufort, by its finer habit, somewhat dichotomous branching, longer segments, and 
lighter brownish color. Since, however, other species with four pericentral cells may enter this region, 
no determination should be made without a careful study of all the characters. 
This is the northern known limit of the species. It seems probable that the specimens found here 
were brought by the Gulf Stream from Florida or the West Indies, since it is not likely that the species 
could grow in winter at a more northern station. 
2. Polysiphonia harveyi Bailey. Fig. 41A; Pl. CVIII, fig. 4c. 
Polysiphonia harveyi, Bailey, 1848, p. 38. 
Polysiphonia harveyi, Harvey, 1853, p. 41, pl. 17 A. 
Polysiphonia harveyi, Farlow, 1882, p. 171, pl. rs, f. 3-4. 
Polysiphonia harveyi, De Toni, 1903, D. 897. 
A. A. B. Ex. No. 133a, b. 
P. B.-A. Nos. 888, 1400. 
Fronds forming globose, bushy tufts 2 to 15 cm. tall, setaceous, rather rigid, branching abundant. 
decompound, pinnate, sometimes irregular, usually alternate, branches more or less elongated, spreading, 
sometimes angularly bent, tapering and sometimes divided into numerous fine branchlets toward the 
apices, secondary branches sometimes almost as coarse as the primary ones, branchlets arising irregularly, 
more or less abundant over the entire frond, about 1 to 2 mm. long, spinelike, rigid, spreading, tapering 
toward the apices, simple or forked, often shed from older plants; pericentral cells four, segments short 
throughout, about 1 diameter in length, sometimes less, sometimes up to 2.5 diameters, no cortex, but 
in the older portions of the frond four small secondary cells occur outside of and alternating with the 
pericentral cells; tetrasporangia forming wartlike swellings in the branchlets; antheridia ellipsoid: 
cystocarps broad-ovate, toward the apices of small branches; color dark purplish red. 
Nova Scotia to North Carolina. 
Occasionally fairly abundant on buoys and on alge thrown on Bogue Beach, Beaufort, N. C., July 
to October, fruiting. Fairly abundant on buoy in sound, Port Royal, S. C., August, 1909 (?). 
This species may be distinguished from P. havanensis, the only other species with four pericentral 
cells thus far found at Beaufort, by its coarser habit, more or less regular pinnate branching, shorter 
segments, and darker purplish-red color. It is the only identifiable species with four pericentral cells 
that has been found growing in this region. Specimens apparently belonging to this species were col- 
lected at Port Royal, S. C., but unfortunately were lost before they were compared with authentic speci- 
mens. It remains doubtful, therefore, whether Beaufort, N. C., or Port Royal, S. C., is the southern 
known limit of the species. Of the fruiting plants observed about go per cent were tetrasporic, 5 per cent 
male and 5 per cent female. 
3. Polysiphonia denudata (Dillwyn) Kuetzing. Fig. 41B; Pl. CVIII, fig. 4a, b; Pl. CTX, figs. 1 and 2. 
Conferva denudata, Dillwyn, 1809, p. 8s, pl. G. 
Hutchinsia variegata, Agardh, 1824, p. 153. 
Polysiphonia variegata, Zanardini, 1841, p. 60. 
Polysiphonia denudata, Kuetzing, 1849a, p. 824. 
Polysiphonia variegata, Harvey, 1853, D. 45- 
Polysiphonia variegata, Farlow, 1882, p. 173. 
Polysiphonia variegata, De Toni, 1903, p. 922. 
A. A. B. Ex. No. 135. 
P. B.-A. Nos. 245, 639. 
Fronds forming dense, globose tufts, 2 to 25 cm. tall, setaceous and rather rigid below, 
capillary and flaccid above, branching dichotomous, decompound, abundant, axils spreading below, acute 
