518 BULLETIN OF THE BUREAU OF FISHERIES. 



H. agardhii also bears a strong superficial resemblance to Chrysymenia halymenioides Harv. Fruiting 

 specimens are easily distinguished, since in the latter species the cystocarps are large and prominent, 

 forming conspicuous excrescences on the surface; sterile specimens may be readily distinguished by the 

 structure, the frond of C. halymeniodes forming a delicate tube filled only with jelly, internal filaments 

 being almost or entirely lacking, and the wall composed of only two or three layers of cells. 



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



a. Halymenia floresia (Clemente) Agardh. PI. CXII, fig. 2. 



Fucus floresius, Clemente, 1807, p. 312. 

 Halymenia floresia, Agardh, 1812, p. 209. 

 Halymenia floresia, Harvey, 1833, P. 193- 

 Halymenia floresia, De Toni, 1905, p. 1545. 

 P. B.-A. No. 298. 



Frond flattened, 6 to 30 cm. tall, arising from a basal disk, supported on a stipe tapering into the 

 frond, pinnately decompound, main axis flattened, i to 6 cm.jwide, pinnae flattened, pinnules somewhat 

 flattened or rather terete, both long, linear, acuminate, spreading, margins of pinnae and pinnules entire 

 or beset with numerous teeth or cilia, inner filaments rather sparse and lax, intermixed with jelly, cortex 

 consisting of one or two layers of cells; tetrasporangia occurring among the cortical cells, inconspicuous; 

 cystocarps suspended within the cortex, inconspicuous, forming no swellings on the surface, appearing 

 as minute dots scattered over the frond; texture gelatinous, delicate; color pinkish straw to bright 

 rosy pink. 



Warm North Atlantic; Mediterranean; Red Sea. 



One fragment, Bogue Beach, Beaufort, N. C., September, 1904. 



The battered fragment found at Beaufort is 12 cm. long, but does not include either the base or the 

 apex. It resembles specimens of the species from other regions, except that it is less frequently branched. 

 This species will not be mistaken for any other within our range. 



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



3. Halymenia gelinaria Collins and Howe. Fig. 44; PI. CXII, figs. 3 and 43. 



Halymenia gelinaria, Collins and Howe, 1916, p. 173. 



P. B.-A. Nos. 749 (Halymenia floridana), 750 (Halymenia floridana forma dentata), 2050. 



Frond flat, about 5 to 60 cm. tall, 3 to 60 cm. wide, borne on a short, narrow, filiform, conspicuous 

 stipe a few mm. long, suborbicular, oblong, ovate, or cuneate-obovate, subentire or rather sparingly 

 parted, lobed, or proliferous, the margins entire or very irregularly cut in various ways; medulla tra- 

 versed by few or many irregularly branched, conspicuously segmented filaments of different sizes, 

 frequently anastomosing and occasionally forming structures resembling stellate ganglia, cortex one to 

 four cells thick, outermost cells more or less vertically elongate, cuticle frequently dissolved, so that 

 the surf ace appears papillate ; tetrasporangia scattered among the superficial cells; cystocarps numerous, 

 scattered, minute, often slightly protuberant on one surface; texture rather gelatinous; color light 

 purplish pink to dark, purplish red, often with a tinge of greenish yellow. 



Florida. 



Occasional on Bogue Beach, Beaufort, N. C., summer and autumn, few small plants dredged from 

 coral reef offshore, May, 1907, and July, 1915. 



This species, placed in Herb. Agardh under Halymenia floridana and included in that species by 

 previous authors, has been separated by Collins and Howe (1916), since it differs decidedly from the form 

 that is generally recognized as the type of that species. It has a rather thick, gelatinous texture, the 

 structure is decidely loose, the cortex consisting of usually one, sometimes two or more, layers of large, 

 loose cells, from which project small, vertical, papillate cells, often not bounded by a definite cuticle ; the 

 medullary portion is usually not densely filled with jelly and is traversed by very scattered, irregularly 

 branched, conspicuously segmented filaments of different sizes; anastomoses are often abundant and 

 conspicuous toward the surface; in surface view the surface appears papillate; a subepidermal view 

 seen from the surface shows numerous filaments of various sizes radiating from common centers and 

 anastomosing, but forming a homogeneous part of the structure, heteromorphous "stellate ganglia" 

 being rare; the color is light, purplish pink, to dark, purplish red, usually with a decided tint of greenish 

 yellow. 



