MARINE ALG# OF BEAUFORT, N. C. 423 
Genus 1. Endoderma Lagerheim. 
Endoderma, Lagerheim, 1883, p. 75. 
Entoderma, Wille, in Engler and Prantl, 1897, p. 94. 
Frond microscopic, creeping on or within other alge 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. 
Endoderma viride (Reinke) Lagerheim. 
Entocladia viridis, Reinke, 1879, p. 476, pl. 6, £. 6-9. 
Endoderma viride, Lagerheim, 1883, p. 75. 
Endoderma viride, De Toni, 1889, p. 209. 
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 1 to 6 diameters 
long, sometimes cylindrical, more often irregularly swollen and contorted, with one pyrenoid; terminal 
cell blunt or tapering; growing in cell walls of various alge. 
Massachusetts; Europe. 
Fairly abundant on each of four specimens of Cladophora catenata (?), 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 16 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. 1. 
Ulvella lens, Crouan, 1859, p. 288, pl. 22, f. 25-28. 
Ulvella lens, De Toni, 1889, p. 148. 
Ulvella lens, Collins, 1909, p. 286, pl. rr, f. ro2. 
Fronds orbicular, 1 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 Bérgesen in the Danish West Indies, this species is not recorded from 
any other locality in North America. 
Order 2. Siphonocladiales. 
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............ 
EAE a ae eerPOD RIM Peveren tie eure Tatty iebEY rete, er OL RP OE ELSES PEEL Del 1. CLADOPHORACE& (p. 424). 
Frond creeping, boring in shells, zoospores produced in distinct, ultimately detached spor- 
BUR AL Te eee eee he. dis See, as ee PE EG See 2. GOMONTIACE& (p. 429). 
