Ser. MelanospermEjE. Fam. Dictyotea. 



Plate XCL 

 PADINA PAVONIA, Lamour. 



Gen. Char. Root coated with woolly fibres. Frond flat, ribless, fan-shaped, 

 marked at regular distances with concentric lines, fringed with arti- 

 culated filaments; apex involute. Fructification, linear, concentric 

 sori, bursting through the epidermis of the frond, containing at matu- 

 rity, numerous obovate utricles or tetraspores, fixed by their base, and 

 containing four sporules. Padina — a name invented by Adanson, 

 who has not explained the meaning. 



Padina Pavonia ; frond between membranaceous and coriaceous, broadly 

 fan-shaped, entire or deeply cleft, powdery on its outer surface; 

 concentric lines numerous. 



Padina Pavonia, Lamour. Diet. Class. d'Hist. Nat. vol. 12. p. 589. Gaill. 

 Diet. Hist. Nat. vol. 53. p. 371. Grev. Alg. Brit. p. 62. t. x. Hook. Br. 

 Fl. vol. ii. p. 281. Harv. Man. p. 30. Wyatt, Jig. Daunt, no. 11. /. Ag. 

 Alg. Medit. p. 39. Endl. Brd Suppl. p. 25. Menegh. Alg. Ital. and Balm. 

 p. 239. Montg. Hist. Cuba, p. 67. Cell. Canar. p. 145. Alger, p. 33. 



Padina Mediterranea, Bory, Moree, p. 75. Montag. Crypt. Alg. n. 79. 



Dictyota 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. 



Ulva Pavonia, Linn. Syst. Nat. p. 719. Esper. App. t. 4. E. Bot. 

 t. 1276. Per/. Fl. Atlant. vol. ii. p. 428. Roth. Cat. vol. ii. p. 240. 

 vol. hi. p. 322. 



Ulva cucullata, 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 in shallow pools, at half-tide level. Annual. Summer and 

 autumn. Several places along the southern coasts of England ; abun- 

 dant at Torquay. Jersey, Miss White and Miss Turner. 



Geogr. Distr. Atlantic shores of France and Spain. Very abundant in the 

 Mediterranean. Tropical, Atlantic, and Indian Oceans. 



Descr. Root, an expansion, densely coated and cushioned with woolly filaments. 

 Fronds tufted, two to five inches in height, cuneate and attenuate at the 

 base, broadly fan-shaped upwards, simple, or cleft from the summit into 

 several lobes, which as they increase in size, gradually acquire a fan-shaped 

 outline, the apical margin being circularly curved. The whole frond of 

 young plants, and the several lobes of those further advanced, are, when 

 growing, curled round into funnel-shaped cups. At distances of one to 

 two fines the frond is marked with concentric bands, along each of which 

 a fringe of orange-coloured articulated filaments, of extreme tenuity, and 

 about two fines in length, extends. These, which originally have clothed 

 every band or zone, are seldom found perfect, except on the two or three 

 uppermost, and on the marginal one ; falling away as the frond advances. 

 The margin at the summit of the frond is strongly rolled inward-; the 

 outer or lower surface, is covered, more or less perfectly, with a white 

 chalky powder; the inner, except for the fringes of filaments, is smooth, 

 and of a yellowish olive, reddish towards the base, and greenish toward the 

 apex. Substance thiekish, subcoriaoeoiis below, delicately membranous 



2 \' 



