MARINE ALGM OF BEAUFORT, N. C. 493 



composed of a single layer of large cells; tetrasporangia scattered over the surface of 

 branches and branchlets among the cortical cells, triangularly divided; antheridia usually 

 on separate plants, borne singly on the tips of short filaments which arise in branching 

 clusters from the thallus cells; cystocarps scattered over the frond, ovate, opening by 

 a conspicuous apical pore, arising from the base ot the cavity, surrounded by a filamentous 

 network, composed of several simultaneously or successively formed lobes, bearing 

 numerous oblong or obovate carpospores from the outer segments of branched fruiting 

 filaments, conglobate without conspicuous order, inclosed by a gelatinous covering. 

 About 12 species, in warm and temperate seas. 



Champia parvula (Agardh) Harvey. PI. CIV, fig. 4. 



Chondria parvula, Agardh, 1824, p. 207. 



Champia parvula, Harvey, 1853, p. 76. 



Champia parvula, Farlow, 1882, p. 156, pi. 15, f. a, 5. 



Champia parvula, De Toni, 1900, p. 558. 



P. B.-A. Nos. 290, 592, 1934. 



Frond slightly flattened, 0.5 to 1.5 mm. wide, 2 to 10 cm. high, branching profuse, often intricate 

 with coalescent branches below, branchlets arising alternately, oppositely, or verticillately, patent, 

 apices tapering slightly, obtuse, bases sometimes slightly constricted, segments of the frond barrel 

 shaped, once or twice as long as broad; tetrasporangia scattered over the branches and branchlets; 

 antheridia forming patches indefinite in extent, occurring sometimes as caps at the ends of branches, 

 usually as bands around older portions of the thallus; cystocarps ovate, scattered, sessile on the 

 branches; texture gelatinous-membranaceous; color light to dark pink, sometimes purplish or greenish. 



Warm and temperate North Atlantic; Mediterranean. 



Fairly abundant throughout harbor, on Fort Macon and Shackleford jetties, and on Bogue Beach, 

 Beaufort, N. C., April, 1908, fairly abundant on coral reef offshore, May, 1907, and July to August, 

 1915, occasional in harbor, on jetties, and on buoys during summer and autumn. Rather scarce in sound 

 near inlet, Wrightsville Beach, N. C., July, 1909. 



This species may be distinguished easily by its hollow-tubular structure septate by transverse 

 diaphragms at more or less evidently constricted nodes. 



Family 3. DELESSERIACEL/E (Nasgeli) Schmitz. 



Thallus flat, very rarely filiform, sometimes perforate or reticulately fenestrate, 

 simple or forked or lobed or proliferous in various ways, structure cellular, sometimes 

 provided with midrib and veins; tetrasporangia triangularly divided, usually occurring 

 in sori embedded in the locally thickened cortex, scattered over the thallus or occurring 

 on special portions, usually regularly arranged and occurring on both sides of the thallus; 

 antheridia, where known, occurring in small, roundish sori scattered over the surface, 

 usually on both sides of the thallus, the antheridia being cut off directly from thallus 

 cells and giving rise, by successive division, to several spermatia; carpogonia closely 

 associated with cells which function as auxiliary cells; cystocarps rather prominent, 

 sessile, scattered over the frond or occurring on special portions, opening by an apical 

 pore, pericarp usually free from the small basal placenta, sometimes joined to this here 

 and there by remnants of the filamentous network, gonimoblast more or less compact, 

 composed of tufts of branched filaments, which arise from a large, basal stalk cell, are 

 developed simultaneously or successively, are loose or compact, sometimes being grouped 

 into lobes, and bear carpospores singly or in short chains or groups from their apices. 



Nearly 200 species, in nearly all seas, principally in warmer, especially Australian, 

 regions. 



