MARINE Al<GM OF BEAUFORT, N. C. 431 



192 mic. long (excluding stalk), 124 to 164 mic. broad, mostly about as broad as long, the apex 

 subtruncate, the outline commonly somewhat obdeltoid; pedicel mostly 15 to 33 mic. (rarely 75 mic.) 

 long, 1 6 to 22 mic. broad, the pedicel cell usually about 19 to 22 mic. long and broad or sometimes 

 broader than long (n by 22 mic.); zoospores unknown; color dark green or olive green. 



-Several small mats mixed with Cladophora sp. dredged from coral reef offshore, Beaufort, N. C., 

 August ii, 1914. 

 Endemic. 



Family 2. BRYOPSIDACELE (Bory) De Toni. 



Vegetative frond unicellular, much branched; chromatophores numerous small 

 disks, each with one pyrenoid; the axis producing below rhizoids, and above branches 

 both of unlimited and limited growth ; in the latter large biciliate, green, female gametes, 

 and usually (?) on separate individuals, smaller, brown, biciliate male gametes are 

 developed ; by the union of the two a zygote is formed, germinating immediately. 



About 30 species, all marine, especially in warmer seas. 



Genus Bryopsis Lamouroux. 

 Bryopsis, Lamouroux, iSoga, p. 133. 



Characters of the family; cavity continuous, without dissepiments, in the vegetative 

 condition. 



Twenty to 30 species. 

 Bryopsis plumosa (Hudson) Agardh. PL LXXXIV, fig. 4. 



Uha f>lumosa, Hudson, 1762, p. 571. 

 Bryopsis plumosa, Agardh, 1822, p. 448. 

 Bryopsis plumosa, Harvey, 1858, p. 31. pi. 45, A. 

 Bryopsis plumosa, Farlow, 1882, p. 59, pi. 4, f. i. 

 Bryopsis plumosa, De Toni, 1889, p. 431. 

 Bryopsis plumosa, Collins, 1909, p. 403, pi. 17, f. 155. 

 P. B.-A. No. 227. 



Frond seldom over 10 cm. high, rich, glossy green; amount of branching variable; typical forms 

 with numerous lateral branches and often a second series; all branches with abundant distichous ramuli, 

 shorter above, giving the branches triangular outlines. 



Maine to Florida; Europe. 



Two or three large masses in harbor, Beaufort, N. C., growing under a wharf, 7 to 10 cm. below low 

 water, April, 1908. 



The most widely distributed species of the genus; it is nowhere very abundant, but occurs in various 

 stations. In its northern range it seems to be more specially a summer plant, but is sometimes found at 

 any season. Variable in appearance. 



At Beaufort this species has not been found in summer, autumn, or winter, and was not observed 

 in May, 1907. 



Family 3. CODIACEJE Zanardini. 



Spongodiaceae, De Toni, 1889, p. 488. 

 Udoteacese, De Toni, 1889, p. 499- 



Frond of definite shape, except in the lowest forms, composed of interwoven, con- 

 tinuous, branching filaments, sometimes apparently pluricellular by constrictions, 

 calcified or not; asexual propagation by zoospores and aplanospores, formed in spor- 

 angia; sexual reproduction by motile gametes, either similar or differing in size. 



About 80 species, all marine, in tropical and subtropical regions, especially in warm 

 seas. 



KEY TO GENERA. 



Not calcified nor stipitate, soft and spongy; cortical layer formed of the swollen ends of the 

 longitudinal filaments; filiform or somewhat flattened i. Codium (p. 432). 



Calcified and stipitate; cortical layer formed of lateral branches, usually smaller than the 



longitudinal filaments; lamina fan shaped . 2. Udotea (p. 433). 



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