MARINE ALG 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. brastliana. 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, Pp. 125. 
Ambhiroa brasiliana, De Toni, 1905, p. 1817. 
Frond forming tufts, 1 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, rg15. 
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 calcified, 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 Linneus. 
Corallina, Linnzus, 1758, tom. 1, p. 805 (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 calcified 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; tetrasporangia zonately 
divided. 
About 40 species, mostly in warm seas. 
KEY TO SPECIES. 
Frond 4 to 8 mm. tall, about o.1 to o.2 mm. in diameter, branching regularly dichotomous 
Sa cote bu Gels Ja Geet ane AdpodBelde Oilgn bu cn YBa ab ooo Oat cobs GoUnBaISIA SEN eO abe SRE GMON ATM Gime AY 
Frond 1 to 2.5 cm. tall, about 0.2 to o.7 mm. in diameter, branching partly pinnate, often bear- 
ing numerous opposite disticlious branchlets ................0.00 0c cece eee 2. C. cubensts (p. 528). 
1. Corallina capillacea (Harvey) comb. nov. Pl. CXIV, fig. 6. 
Jania capillacea, Harvey, 1853, p. 84. 
P. B.-A. No. rso (Jania capillacea). 
Frond erect, capillary, about 4 to 8 mm. tall, 0.1 to o.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, Beaufort, N. C., August, 1903, two to three 
plants on coral reef offshore, May, 1907. 
