46 J. H. PRICE, I. TITTLEY & W. D. RICHARDSON 



Portolonec : 



2.viii.l882, Baray in Herb. E. J. A. Gadeceau (BM). 



General: 



Cove of Dinan (Kerloc'h) to Morne de Treboul, via Cap de la Chevre, Presqu'tle de Crozon : 

 Dizerbo (1946), in CystoseirajLaminaria saccharina pools at Fucus serratus level . . ., can develop 

 ahead of time, at beginning March, in good spring with favourable temperatures ... a principal 

 species of summer and autumn in sandy places, observations 1935-1941. 



Bate de Douarnenez and Presqu'ile de Crozon, between Camaret and Douarnenez : Dizerbo & 

 Tourseiller (1959), rare on open coasts, common in the bay. 



Vile Cordinet [Douarnenez-Treboul region]: Prenant (1939), on stones and sand, causeway 

 island/mainland at very low tide, occasional, amongst the dominant Laminaria saccharina. 



Finistere: Roemer in Herb. R. J. Shuttleworth (BM). 



Brittany: Lyle (1923). 



Padina shows patchy but locally abundant distribution in Brittany; it is symptomatic of this 

 that the alga has rarely been reported from Roscoff. Cardinal (1964 : 60) indicated its absence from 

 that area. This lack of records is unlikely to represent absence of observations or collections. Since 

 the establishment of the Laboratoire de Roscoff in 1872, the immediate area has been subject to 

 careful scrutiny over all seasons for many years. Chalon, the first director of the extended Roscoff 

 Laboratory, published (1909) a list of the marine algae which had to that time been collected in the 

 area around, including records by Crouan freres (1852, 1867), by himself earlier (1905), and some 

 previously unpublished. Some apparent absences were sufficiently surprising for him to comment 

 - '. . . II faudra essayer en des places convenablement choisies des rochers, certaines naturalisa- 

 tions, telles que Padina pavonia ... si abondants a peu de distance en conditions identiques . . .'. 

 Chalon later published (1910) additions to his Roscoff list, noting, Padina as present on not entirely 

 satisfactory evidence '. . . D'apres 1'herbier du Dr. Denis . . .'. Among later workers, Beauchamp 

 (19146) indicated that P. pavonica doubtless grew towards the limits of the region, but he had no 

 firm evidence of it elsewhere than to the east, at Locquemeau (Cotes du Nord), in flat sandy hollows. 



Locquemeau is in a fairly sheltered position, but so are many other areas near it and apparently 

 lacking, or not having reports of, Padina. This is equally true of the northern (English Channel) 

 coast of Brittany, along which many localities have apparently the environmental conditions for 

 supporting populations but for which no published data have been traced. As for Cornwall (q.v.), 

 this is anomalous and can be confirmed or revised only by prolonged local studies. Apart from 

 Holmes's Boscastle report, Cornwall equally lacks records from its north-facing (non-English 

 Channel) coasts, whereas the south-facing (non-English Channel) coast of Finistere south of lies 

 d'Ouessant is rich in sheltered localities with abundant data on presence and distribution of 

 Padina. For these latter records, patterns of distribution, habitat conditions, and maximum 

 abundance/luxuriance periods agree with those noted elsewhere along English Channel coasts. 

 Dizerbo commented (1946) interestingly on early (March) appearance of Padina in favourable 

 years; this is consistent with events in southern England. 



Morbihan 



Gavres (point south of V Orient): 

 Hamel (1939) (Montagne). 



Quiberon Peninsula : 



Davy de Virville (\952a), sheltered gentle slopes, in rocky Cystoseira pools amongst Asco- 

 phyllum, not common; Davy de Virville (1962), (i) on semi-exposed southern end of peninsula, 

 from Beg er Lan to Pointe du Conguel, in pools below F. spiralis; (ii) Chenal du Trou, south coast 

 before Pointe du Conguel, 27.viii.1949; (iii) in large channel with sand/mud bottom, at Goviro, 

 near low tide level; (iv) on wave-beaten pebbly bottoms away from that channel; (v) similar 

 channels at Port Goulvars; (vi) on flat rocks, at very low tide level, rocky Pointe du Canon (north 



