MARINE ALGH OF BEAUFORT, N. C. 429 
Fronds elongate, up to 50 cm. long; main filaments and principal branches flexuous, sparingly 
alternately branched, the ends beset with rather long, pectinate, more or less densely fasciculate ramuli; 
main filaments 200 to 250 mic. in diameter, cells 2 to 4 diameters long; ramuli 80 to 120 mic. diameter, 
cells usually 1 to 2 diameters long. 
Florida; West Indies; South America; Red Sea. 
Abundant in bay at New Inlet, Southport, N. C., August, 1909, floating and attached to shells and 
grass, 7 cm. above to 7 cm. below low water. 
This is the most northern station reported for this species. 
4. Cladophora prolifera (Roth) Kuetzing. 
Conferva prolifera, Roth, 1797, pl. 3, f. 2. 
Cladophora prolifera, Kuetzing, 18458, p. 207. 
Cladophora prolifera, De Toni, 1889, p. 306. 
Cladophora prolifera, Collins, 1909, p. 348. 
Fronds dense, dark green when growing, blackish when dried, up to 20 cm. high, rarely more; 
filaments coarsely membranaceous or cartilaginous, 300 to 400 mic. in diameter, dichotomous or tri- 
chotomous, divisions mostly erect, more frequent toward the somewhat fastigiate tips; ramuli 130 to 
200 mic, diameter, blunt; cells up to 20 diameters long in the main filaments, much shorter in the 
branches, 4 to 6 diameters long in the ramuli. 
Porto Rico; Barbados; Mediterranean; Red Sea. 
Bogue Beach, Beaufort, N. C., two fragments, August and September, 1904, four small fragments, 
August, 1907(?). 
A coarse, dark species, distinguished with comparative ease. 
Besides the above-mentioned species, material of Cladophora, insufficient for 
specific determination, has been found at Fort Macon, on the buoys, on Bogue Beach, 
floating in Beaufort Harbor, and at Ocracoke. A few specimens gathered on Bogue 
Beach, August, 1907, resemble C. catenata (Ag.) Ardis., but are not included among the 
descriptions, since they are insufficient for a satisfactory determination. A small 
amount of Cladophora was collected in the harbor in January, 1909, but at no other 
time during the winter. Except for such scanty material, which is fairly constant on 
the sand breaks and rocks at Fort Macon during the summer and autumn, all the species 
of Cladophora at Beaufort seem to be transient visitors. None has been found there in 
any two successive years. 
Family 2. GOMONTIACE@ Bornet and Flahault. 
Fronds consisting of creeping, branched filaments, penetrating various shells, in 
one species penetrating wood; cells multinucleate; asexual propagation by biciliate 
zoospores or possibly by aplanospores, both produced in sporangia formed usually on 
the upper surface of the horizontal layer; sexual reproduction by biciliate gametes (?). 
Genus Gomontia Bornet and Flahault. 
Gomontia, Bornet and Flahault, 1888a, p. 164. 
Filaments usually radiating, irregularly branched; aplanospores develop directly 
into vegetative filaments, or first form new aplanosporangia (?). 
Six species, mostly marine, two in fresh water, North America and Europe. 
The observations of Moore (1918) tend to alter the previous conception of this 
genus, indicating that the structures previously regarded as aplanospores are formed 
from zoospores which pass into a resting condition and delay their germination for an 
indefinite time. No evidence for the existence of gametes was obtained by this author. 
