Ser. MELANOSPERME^.. ( 71 ) Fam. DICTYOTEiE. 



Plate CLVL 

 PADINA PAVONIA.— irtwwwr. 



Gen. Char. — Frond cellular, coriaceous, flat, flabelliform, more or less cleft into nume- 

 rous broad rounded lobes, marked with darker concentric lines, and involute at 

 the apex. Fructification : utricles or tetraspores, grouped in linear concentric 

 sori, and bursting through the epidermis of the frond ; they are obovate, and, 

 when matui-e, divide in a cruciate manner into four sporules. Name of unknown 

 origin. 



Padina Pavonia. — Frond thin, broadly flabelliform, more or less deeply- 

 cleft into numerous broad obcuneate lobes, with rounded apices, its sur- 

 face covered with a whitish powder, and marked by many concentric 

 dark lines. 



Padina Pavonia. —Lamour. Diet. Class. cVHist. Nat. vol. xii. p. 589 ; Gaill. Diet. 

 Hist. Nat. vol. liii. p. 371 ; Grev. Alg. Brit. p. 62, t. 10; Hooh. Br. 

 Fl. vol. ii. p. 281; Wyatt, Alg. Damn. No. 11; /. Ag. Alg. Medit. 

 p. 39 ; Endl. 3rd Suppl. p. 25 ; Menegh. Alg. Hal. et Dalm. p. 239 ; 

 Monfg. Hist. Cuba, p. 67 ; Cell. Canar. p. 145 ; Alger, p. 33 ; Harv. 

 P. B. plate 91 ; Harv. Man. p. 37 ; Harv. Syn. p. 31 ; Atlas, plate 9, 

 fig. 35; Harv. N. B. A. part 1, p. 104 ; /. G. Agardh, Sp. Gen. Alg. 

 vol. i. p. 113. 



Padina Mediterranea.—Bory, Moree, p. 75; Montag. Crypt. Alg. No. 79. 



DiCTTOTA Pavonia. — Lamour. Ess. p. 57. 



ZoNARiA Pavonia.— Ag. Sp. Alg. vol. i. p. 125 ; Ag. Syst. p. 263 ; Spreng. Syst. 

 Veg. vol. iv. p. 326 ; Kiitz. Phyc. Gen. p. 341, t. 22, f. 1. 



Ulta Pavonia. — Linn. Syst. Nat. p. 719; Esper, App. i. i ; E. Bot. t. 1276; 

 Desf. FL Atlant. vol. ii. p. 428; Roth, Cat. vol. ii. p. 240; vol. iii. 

 p. 322, 



Ulva eucullata. — Cav. Ic. vol. ii. p. 73, t. 191, f. 2 e. 



Fucus Pavonius,—Linn. Sp. PL vol. ii. p. 1630 ; Wulf. Crypt. Ag. p. 33. 



Hab. — On rocks and stones in tide-pools about half- tide level. Annual. Summer aud 

 autumn. Not rare in many places on the south coasts of England. Jersey. 



Geogr. Dist. — Atlantic shore.? of France and Spain ; Tropical, Atlantic, and Indian 

 Oceans. 



Description. — Eoot, a conical mass of woolly-like fibres. Fronds 

 much tufted, two to three inches in length, and the same in breadth, 

 with a narrow, flat, wedge-shaped base, suddenly expanding at about an 

 inch or an inch and a-half from the base into a broad renifoi-m or flabelli- 

 form frond, more or less cleft into numerous broad, rounded, obcuneate 



