4 88 BULLETIN OF THE BUREAU OF FISHERIES. 



apices of the segments, embedded in the scarcely altered cortical layer; cystocarps rather prominent, 

 hemispherical, sessile, on the margins or surface of the terminal segments; texture membranaceous or 

 slightly fleshy; color light to dark rose. 



Temperate North Atlantic; Mediterranean. 



Occasional on Bogue Beach, Beaufort, N. C., April to September, sometimes fruiting, occasional 

 on Fort Macon jetties about low water level, May to August since 1906, few plants on coral reef offshore, 

 May, 1907, and August, 1915. 



The habit of this species ranges from tall, slender, little-branched forms to short, wide, compact, 

 much-branched ones; the texture varies from thin, membranaceous to rather thick fleshy; the widened 

 frond may arise almost directly from the base or may be borne on a more or less elongated stipe. Some- 

 times the older portions of the frond are membranaceous, while the younger apices are fleshy. 



At Beaufort the plants growing on the jetties were compact, fleshy, and much branched, while 

 many of those from the beach were membranaceous and sparingly branched. Plants were not observed 

 growing in the harbor before -1906. This is the northern known limit of the species on our coast. 



Genus 2. Agardhinula De Toni. 



Agardhinula, De Toni, 18973, p. 64. 



Frond flat, dichotomously branched, structure cellular, the medullary portion com- 

 posed of several series of large, rounded cells, with smaller cells toward the periphery 

 and in the spaces between the larger ones, the cortical portion composed of i to 3 layers of 

 small cells, sometimes arranged in vertical rows; tetrasporangia borne in sori scattered 

 over the surface, immersed in the thicker portions of the cortical layer, cruciately divided ; 

 cystocarps prominent, scattered over the frond, hemispherical, opening by an apical pore, 

 gonimoblast attached by a few filaments to the flat base of the fruiting cavity, forming 

 a compact, rounded mass of carpospores, very loosely inclosed by branching filaments 

 running from the wall of the cystocarp. 



One species. 



The structure of the frond in this genus is between that of Rhodymenia and 

 Chrysymenia, more nearly resembling the latter. 



Agardhinula browneae (J. Agardh) De Toni. Fig. 33; PI. CII, fig. i. 



Callophyllis browneae, J. Agardh, 1884, p. 36. 

 Diplocystis brownece, J. Agardh, 1896, p. 94- 

 Agardhinula brawnea, De Toni, 18973, p. 64. 

 Agardhinula brawnece, De Toni, 1900, p. 523. 



Frond flat, decompound-dichotomous or somewhat palmate, sometimes proliferous from the slightly 

 thickened margin, 10 to 30 cm. or more tall, i to 5.5 cm. wide, rather thick, tapering below to a cuneate 

 base, segments spreading above rounded sinuses, lower ones wide, upper ones narrower, linear below, 

 dilated above, apices truncate or oblong-obtuse; tetrasporangia in more or less confluent sori covering 

 most of the surface and separated by sterile areas; cystocarps very prominent, densely scattered over 

 the frond, less abundant toward apices; texture cartilaginous-gelatinous; color light pink. 



Florida. 



One cystocarpic plant, Bogue Beach, Beaufort, N. C., August, 1903; several plants cystocarpic and 

 tetrasporic, Bogue Beach, September 2, 1903. 



This species has not been previously recorded since its original discovery on the shore of Florida. 

 The Beaufort plants have been carefully compared with a photograph and a fragment of the type; with 

 this they agree in all respects, notably in the structure of the frond and the cystocarp, so that the deter- 

 mination seems reasonably sure. Since this species has been found at Beaufort only on the two days 

 mentioned above, it seems probable that these plants did not grow in this region, but were brought here 

 by the Gulf Stream from some remote southern locality. 



