THE DISTRIBUTION OF PADINA PAVONICA 1 1 



suggest that these may be foci, but northern Spain is insufficiently studied to be certain of the 

 Basque coast's separateness, and southern Portugal is only separated from Cadiz by the sandy and 

 swampy Huelva. Cadiz, very near the entrance to the Mediterranean and long observed and 

 collected, represents the start of the more or less continuous Mediterranean populations. These 

 more southerly north-east Atlantic records demonstrate a tendency for the plant to be noticed 

 rather earlier in the year, and in significantly larger amounts, than is the case for Great Britain. 

 April, May, and June appear much better represented amongst Padina collections from Atlantic 

 Spain and Portugal than from Britain. The predominance of both vegetative and tetrasporangial 

 records remains, even outside Britain, in the period July-September inclusive. Largely, this is 

 because northern French populations reveal a pattern little different from that on southern British 

 shores. The greater abundance of April- June records from outside the British Isles affirms that 

 the maintained July-September predominance is hardly merely a reflection of collecting habits; it 

 could be interpreted as indicating in addition that collectors begin earlier in the year in the com- 

 paratively milder areas further south than Great Britain! There are fewer data for countries 

 outside Great Britain on the periodicity and geographical distribution of tetrasporangia. The 

 Channel Islands interestingly show a close correlation with the British focal areas in percentage of 

 tetrasporangial records (42 %) amongst total records; other areas (Manche, Cadiz) for which there 

 are larger numbers of records also tend to approach similarly large percentages (22%; 28% 

 respectively) with tetrasporangia. With further additions to the data, the similarity to southern 

 Britain in this Padina characteristic may well be closer. It may reflect a parity of longevity and 

 security of tenure amongst plants in populations above a certain (not yet identifiable and probably 

 variable) size. 



Distribution along the coasts of the British Isles 



This section is organised geographically under the names of counties as accepted prior to the 

 recent reorganisation. The order of counties is clockwise, commencing in the north-east. Within 

 each county, locations are in a geographical order that begins at the border with or nearest to the 

 previous county. Under each location, the arrangement of records is chronological where practi- 

 cable; this best reveals both current distribution and changes that can be reliably shown to have 

 occurred with time. Ireland, with few records, either older or recent, is treated separately and 

 lastly. The Channel Islands, being most closely associated with the French coast, are treated as 

 part of the continental distribution pattern of Padina pavonica. Standard abbreviations for 

 herbaria are used in specimen records; where no standard abbreviation exists, one has been 

 constructed along the same lines and is indicated by an asterisk (*) in the following list: 



BEL Ulster Museum, Belfast 



BM British Museum (Natural History) 



*BMN Bodmin Museum 



BTN Brighton Art Gallery and Museum 



CGE Botany School, University of Cambridge 



CHR Grosvenor Museum, Chester 



COI Department of Botany, University of Coimbra, Portugal 



CRK Department of Botany, University College, Cork 



DBN National Museum of Ireland, Dublin 



E Royal Botanic Gardens, Edinburgh 



FKE Folkestone Public Library, Museum and Art Gallery 



GL Department of Botany, University of Glasgow 



GLAM Glasgow Corporation Art Gallery and Museum 



HAMU Hancock Museum, Newcastle-upon-Tyne 



K in BM Royal Botanic Gardens, Kew; material now in BM 



L Rijksherbarium, Leiden, Netherlands 



LINN Linnean Society of London 



LISU Department of Botany, University of Lisbon, Portugal 



LIV City of Liverpool Museums (including LIVU - Liverpool University) 



NMW National Museum of Wales, Cardiff 



