MARINE ALG^E 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 i 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, pi. 3, f. 2. 

 - Cladophora prolifera, Kuetzing, 18453, 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, i907(?). 



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. catenate (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. GOMONTI ACE/E 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, Bomet and Flahault, i888a, 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. 



