THE DISTRIBUTION OF PADINA PAVONICA 49 



Gironde; Landes 



Gironde : 



Arcachon: Chantelat (1844), moderately common along the edges of the dock, at Chapelle 



d'Arcachon, June, July. 

 Muollo: Chantelat (1844), moderately common along the edges of the dock at Muollo, June, 



July. 

 Gironde general: D'Orbigny (1820), coasts of Gulf of Gascony (Gironde), level two (1-5 m 



below MHW to 4-5 m below HLW), common. 



Landes : 



D'Orbigny (1820), see Gironde above; Sauvageau (1897), fond du Golfe de Gascogne (and 

 therefore Landes), annual plant only once found during winter, as very small tuft among 

 Cutler ia, by contrast frequent in summer. 



These almost unbroken expanses of coastline run virtually due south from the Gironde 

 estuary (le Verdon-sur-Mer), to the rocky areas of Basses Pyrenees (near Bayonne). Loosely 

 described as Les Landes or Cote d' Argent, the whole region shows coastal homogeneity 

 characterised by Dangeard (1961 : 5) as '. . . plages sableuses et monotones de la region landaise . . .'. 

 The only significant interruption is the Bassin d'Arcachon, the source of the only precisely 

 localised original records from Gironde. According to Chantelat (1844), this large natural basin 

 at that time supported fairly common populations of Padina in at least two locations. Padina 

 periodicity here was summarised by Sauvageau (1897), for Arcachon and the 'Fond du Golfe de 

 Gascogne' (including Landes). Even this far south, periodicity accords well with that in England, 

 where in mild seasons Padina can occasionally be detected during winter; possibly this is because 

 the sea, except in lagoons along the sandy shore, is not so warm in Landes as on the more 

 sheltered coasts to the north. Detailed treatment of the physical environment is presented for 

 southern Landes by Dulau (1967). 



Basses Pyrenees 



Chambre d' Amour : 



Evans (1957), widespread growths; Renoux-Meunier (1965), Cap Saint-Martin, Biarritz, 

 channels, constantly immersed save for low spring tides, between irregular blocks on the fore- 

 shore below cliffs provide records of otherwise unreported species for the area, including (around 

 LWS) Padina. 



Nord du Promontoire du Halde : 



Lancelot (1963), around and below MTL on sandstone, with large hollows, in several sandy 

 pools well exposed to warm sunshine, summer and autumn. 



Biarritz : 



Peytoureau (1885); Roemer in Herb. R. J. Shuttleworth, received 1877, '. . . Les roches . . .' 

 (BM). 



Guethary : 



Peytoureau (1885); Sauvageau (1920), vii/viii.1895, 1896, and ix.1920; Hamel (1931) 

 (Sauvageau vii, viii); Hamel (1939) (Sauvageau); 9.ix.l854, Herb. G. Thuret (K in BM). 



Rocks to south of Guethary : 



Hoek & Donze (1967), rock pools. 



St Jean-de-Luz : 



Peytoureau (1885); Beauchamp (1907), and coast from Pointe de Biarritz, at Cap Figuier, to 

 opposite bank of Bidassoa at Hendaye-Ville, tide-pools with sand/gravel/consolidated pebble 



