Ser. GONGYLOSPEKME.E. ( 45 ) Fam. CKYPTONEMIACEi-E. 



Plate LXXXIII. 

 GYMNOGONGRUS -NOUYEGICUS.—Lamour. 



Gen. Char. — Frond between cartilaginous and liorny, cjdindrical, compreBsed or jilane, 

 composed of two strata of cells ; tliose of the inner stratum roundisli, angular, 

 smaller outwards; tliose of the outer minute, forming vertical moniliform 

 filaments, very densely packed. Fructification of two kinds, on distinct plants ; 



1. Favellidia, immersed in the substance of the frond, and more or less prominent ; 



2. Nemathecia, foi-med of radiating filaments, whose articulations are at length 

 resolved into tetraspores. Name from yvf^vhs, " naked," and ySyypos, a word 

 applied by Theophrastus to a disease resembling a swelling to which trees are 

 subject ; the allusion is to the appearance of the fruit in these Algoa, 



Gtmxogongrus Norvegicus. — Frond linear, flat, dichotomously 

 branched, apices rounded, obtuse ; favellidia imbedded in the substance 

 of the frond, very minute ; nemathecia spherical, scattered over the 

 surface of the frond. 



Gymnogonqrus Norvegicus. — Lamour. Ess. p. 39 ; Lyngl. Hyd. Dan. p. 16 ; Grev. 

 Alg. Brit. p. 130 ; Wyatt, Alg. Lanm. No. 120 ; /. Ag. Alg. Medit. 

 p. 95 ; Mont. Fl. Algier. p. 117 ; Endl. 3rd Suppl. p. 39 ; Harv. in 

 Maclc. Fl. Hih. part 3, p. 202 ; Harv. P. B. plate 187 ; Harv. Man. 

 p. 142 ; Harv. Syn. p. 115; Atlas, plate 44, fig. 203; Harv. N. B. A. 

 part 2, p. 166 ; /. G. Agardk, aS);. Gen. Alg. vol. ii. p. 320. 



Sph^rococcus Norvegicus. — Ag. S2X Alg. vol. i. p. 255 ; Ag, Syst. p. 218 ; Spreng. 

 Syst. Veg. vol, iv. p. 335. 



Oncotylus Norvegicus. — Kiitz. Phyc. Gen. p. 411. 



Fucus Norvegicus.— Gunn. Fl. Norv. vol. ii.- p. 122, t. 3, f. 4 ; Turn. Syn. p. 222 ; 

 Turn. Hist. t. 41 ; E. Bot. t. 1080 ; Stach. Ner. Brit. t. 18, 



Fucus Devoniensis. — Grev. in Wern. Trans, vol. iii. p. 396. 



Hab. — On stones and rocks near low water. Perennial. Not common, but found on all 

 our coasts. 



Geogr. Dist. — Coast of Norway ; shores of France and Spain ; Mediterranean Sea. 



Description. — Root, a broad flattened disc. Fronds slightly tufted, 

 two to three inches high, cylindrical at the base, and about half a line 

 in thickness, gradually expanding into a flattened stem, from half an 

 inch to an inch in length, and at length flat, fom- to five times dichoto- 

 mously divided into naiTow, linear, flat, entire, patent segments, half an 

 inch to an inch long, and from one to three lines in breadth, the axils 

 very broad and rounded, the apices broad and rounded or even 

 emarginate, paler than the rest of the frond. Structui-e : central cells 



