MARINE AUJ^B OF BEAUFORT, N. C. 453 



The Beaufort specimens fit the description of the species and resemble specimens from other locali- 

 ties referred to this species except that in the Beaufort plants the cryptostomata are inconspicuous and 

 sometimes lacking. They have leaves broader and less serrate than in the type, these being as short 

 and broad as in f . contractum J . Ag. with their margins almost as little serrate as in var. montagnei Collins 

 and Hervey. In the Beaufort plants the leaves are lanceolate 1.5 to 3.5 cm. long, 3 to 7 mm. broad; 

 the vesicles are rounded, tapering slightly at the base and sometimes very slightly at the apex, in the 

 latter case bearing a short spinelike tip, their petioles are 1.5" to 3 times the length of the vesicle. 

 The plants from the coral reef have large lanceolate leaves at the base, 8 to 8.5 cm. long, i to 1.3 cm. 

 broad, long, narrow linear leaves at the apex, 3.5 to 5.5 cm. long, 3 to 5 mm. broad, approaching in 

 appearance the leaves of var. montagnei; the serrations are inconspicuous on both kinds of leaves. 



Var. montagnei (Bailey) Collins and Hervey. 



Sargassum montagnei. Bailey, in Harvey, 1852, p. 58, pi. i A. 

 Sargassum vulgare var. montagnei, Farlow, 1882, p. 103. 

 Sargassum filipendula 1. subedentatum, J. Agardh, 1889, p. 120. 

 Sargassum filipendula i. subedentatum, De Toni, 1895, P- i7- 

 Sargassum filipendula var. montagnei, Collins and Hervey, 1917, p. 83. 

 P. B.-A. No. 2176. 



Leaves long, narrow, linear, 2 to 7.5 cm. long, i to 5 mm. wide, serrations almost or entirely lacking, 

 the margins usually being smooth and wavy, cryptostomata often abundant and conspicuous; vesicles 

 rounded or oblong on petioles i to 3 times the length of the vesicle; receptacles cylindrical, branched, 

 cymose-racemose. 



Atlantic shores of North America. 



Abundant on Bogue Beach, Beaufort, N. C., summer and autumn; abundant in trawl offshore 

 from Brown's Inlet, south of Beaufort, N. C., July, 1915. 



The specimens belonging to this form often differ considerably from the species in appearance, 

 but at Beaufort are fairly uniform among themselves. It is not known from what locality these 

 plants have come. 



Besides the species mentioned above, one sterile specimen of another species was 

 found on Bogue Beach, Beaufort, N. C., August 20, 1908. This has rather thick, 

 leathery leaves borne on short petioles, usually long, oblong, or elliptical, 1.5* to 2.7 

 cm. long and 5 to 9 mm. wide, a few being short elliptical, 8 to 13 mm. long and 6 to 10 

 mm. wide, cryptostomata are lacking, the margins are slightly serrate; the vesicles are 

 obovate or rounded, of moderate size, and borne on short stalks. The specimen 

 resembles in some respects herbarium specimens of 5. marginatum (Ag.) J. Ag. or 

 5. ilicifolium (Turn.) Ag., but can not be definitely referred to any species. 



Order 3. Dictyotales Kjellman. 



Tetrasporinse. De Toni, 1895, p. 325- 



Frond of medium size, attached to rocks, etc., light or dark brown, of various 

 forms, usually membranaceous, flat, simple, lobate, or branched, nearly always erect, 

 of parenchymatous structure; asexual propagation by relatively large nonmotile aplano- 

 spores, usually produced four (tetraspores) , sometimes two or eight, from a mother cell 

 (sporangium) ; sexual reproduction by relatively large, nonmotile eggs and small, motile, 

 monociliate sperms; sporangia and gametangia on different plants, usually on unspecialized 

 portions of the thallus, developed from superficial cells, occurring singly or in groups 

 (sori), sometimes accompanied by paraphyses; oogonia and antheridia produced on the 

 same or different plants; sexual and asexual generations, at least in some cases, alter- 

 nating with each other; oogonia producing a single egg; antheridia producing numerous 

 sperms; eggs and sperms discharged into the water where fertilization occurs. x 



