MARINE AI&J& OF BEAUFORT, N. C. 527 



from Bogue Beach are decidedly coarser and wider, but the differences do not seem sufficiently great 

 to warrant placing them in another species. 



This species will not be confused with any other found in this region except A. brasiliana. From 

 the latter it is distinguished by its more calcified, more brittle frond, with the segments terete or 

 nearly so. 



This is the northern known limit of the species and of the genus. 

 2. Amphiroa brasiliana Decaisne. 



Amphiroa brasiliana, Decaisne, 1842 a, p. 125. 

 Amphiroa brasiliana, De Toni, 1905, p. 1817. 



Frond forming tufts, i to 5 cm. tall, segments decidedly flattened, about 0.5 to 1.2 mm. wide, often 

 two to three times as wide as thick, lower segments cuneate or quadrate, upper ones linear-obtuse; branch- 

 ing dichotomous; color dirty white ; texture moderately fragile. 



Brazil. 



One fairly large tuft dredged from coral reef offshore, Beaufort, N. C., August, 1915. 



The plants found here can not be determined with certainty because of the lack of authentic 

 material for comparison. They seem, however, to belong to this species, judging from the descriptions 

 and a photograph of the original material. This species is distinguished from the preceding by its 

 less calcined, less brittle fronds, with decidedly flattened segments. It is not known elsewhere outside 

 of Brazilian waters, unless this species is identical with some described under other names. 



Genus 6. Corallina Linnaeus. 

 Corallina, Linnaeus, 1758, torn, i, p. AS (in part). 



Thallus erect, usually arising from a small basal disk, terete or flattened, segmented, 

 branching dichotomous or lateral, more or less abundant and usually in one plane, 

 strongly calcined except at the more or less elongated joints; medullary portion more' 

 or less plainly transversely zonate, composed of compact, segmented, branched fila- 

 ments, cortex composed of a few layers of small cells, becoming smaller toward the 

 surface, cortex lacking at the joints; conceptacles occurring in the swollen apices of 

 segments or filling the segments, sunken in the medullary layer, forming more or less 

 prominent protuberances, opening by single apical pores; tet^asporangia zonately 

 divided. 



About 40 species, mostly in warm seas. 



KEY TO SPECIES. . 



Frond 4 to 8 mm. tall, about o.i to 0.2 mm. in diameter, branching regularly dichotomous 



i. C. capillacea (p. 527). 



Frond i to 2.5 cm. tall, about 0.2 too.; mm. in diameter, branching partly pinnate, of ten bear- 

 ing numerous opposite distichous branchlets a. C. cubensis (p. 528). 



i. Corallina capillacea (Harvey) comb. nov. PI. CXIV, fig. 6. 



Jania capillacea, Harvey, 1853. p. 84. 

 P. B.-A. No. 150 (Jania capillacea). 



Frond erect, capillary, about 4 to 8 mm. tall, o.i to 0.2 mm. in diameter, branching regularly dicho- 

 tomous; conceptacles formed as flattened swellings at or near the ends of the ultimate branches, 

 opening by a distinct apical pore; from the upper edges of these conceptacles there arise branches 

 (usually two) as continuations of the frond; carpospores club shaped, arising in a compact group from 

 base of conceptacle ; tetrasporangia zonately divided, arising in a compact group from base of conceptacle. 

 Florida; West Indies; Bermuda. 



One small mass on Sargassum sp., Bogue Beach, Beaufor N. C., August, 1903, two to three 

 plants on coral reef offshore, May, 1907. 

 159321 20 11 



