MARINE ALGM OF BEAUFORT, N. C. 423 



Genus i. Endodenna L/agerheim. 



Endoderma, Lagerheim, 1883, p. 75. 



Entodenna, Wille, in Engler and Prantl, 1897, p. 94. 



Frond microscopic, creeping on or within other algae or aquatic plants; filaments 

 irregularly branched, with or without hairs; cell division mostly terminal ; chromato- 

 phore a parietal layer with one or more pyrenoids; zoospores 2 to 4 ciliate, with stigma, 

 formed four or more in a cell, escaping by a hole and soon germinating; sexual repro- 

 duction by biciliate motile gametes without stigma is probable, but not certain. 



About 10 species, marine and fresh water. 

 Endodenna viride (Reinke) Lagerheim. 



Entocladia viridis, Reinke, 1879, p. 476, pi. 6, f. 6-9. 

 Endoderma viride, Lagerheim, 1883, p. 75. 

 Endoderma viride, De Toni, 1889, p. 109. 

 Endoderma viride, Collins, 1909, p. 279. 

 P. B.-A. Nos. 1626, 2006, 2236. 



Filaments usually much branched, 3 to 8 mic., usually 6 mic. diameter, cells i to 6 diameters 

 long, sometimes cylindrical, more often irregularly swollen and contorted, with oYie pyrenoid ; terminal 

 cell blunt or tapering; growing in cell walls of various algae. 



Massachusetts; Europe. 



Fairly abundant on each of four specimens of Cladophora catenate. ( ?), Bogue Beach, Beaufort, N. C., 

 August, 1907. . 



This species seems to have been recorded in North America only from Massachusetts. Its small 

 size makes it easily overlooked, and it will probably be found widely distributed on the Atlantic coast. 



Genus 2. Ulvella Crouan. 



Ulvella, Crouan, 1859, p. 288. 



Fronds forming small disks on larger plants or other objects, firmly attached by 

 the under surface, originally monostromatic, of radiating, laterally united, dichotomous 

 filaments; later polystromatic except at the margin; cells with parietal chromatophore 

 and, in most species, one pyrenoid, arranged in more or less definite vertical series; 

 biciliate zoospores formed in the central cells, 4 to 8 to 1 6 in a cell, escaping by an 

 opening at the top. Marine. 



Few (4 or more) species in North America and Europe. 

 Ulvella lens Crouan. Fig. i. 



Uhella lens, Crouan, 1859, p. 288, pi. 22, f. 25-28. 



Uhella lens, De Toni, 1889, p. 148. 



Ulvella lens, Collins, 1909, p. 286, pi. u, f. 102. 



Fronds orbicular, i to 3 mm. diameter, cells 15 to 20 mic. in diameter in center of frond; near the 

 margin 10 to 15 by 20 to 30 mic., without pyrenoid; frond usually not over three layers thick in the 

 center. 



West Indies; Europe. 



Occasionally forming a green coating on shells, Pamlico Sound, Ocracoke, N. C., August, 1907. 



Except for a recent find by Borgesen in the Danish West Indies, this species is not recorded from 

 any other locality in North America. 



Order 2. Siphonocladiales. s 



Fronds multicellular, usually more or less branched ; cells multinucleate, very rarely 

 uninucleate, chromatophore net shaped, or of numerous small disks. 



KEY TO FAMILIES. 



Frond erect, zoospores and gametes produced in little changed vegetative cells 



I. CXADOPHORACE^3 (p. 424). 



Frond creeping, boring in shells, zoospores produced in distinct, ultimately detached spor- 

 angia ' 2. GOMONTIACE^S (p. 429): 



