4^ 



THE MARINE AIA^E OF aUERNSEY 



PylaieJla Uttoralis var. varin has not been recorded further south 

 than Scotland ; it is a native of the Norwegian Polar Sea, and occurs 

 also in the Arctic Seas. The presence of this plant in Gruernsej is 

 unaccountable : it may have travelled southward in a current that 

 flows down the east coast of England, and, being caught in some of 

 the cross-currents of the Channel, have drifted finally to Guernsey ; 

 or it may have been brought by some other agency, such as ships or 

 even sea-gulls. Alaria is also a northern species belonging to the 

 Faeroes. The Atlantic coast of France forms the southern limit of 

 its distribution ; it has been found in Gruernsey and Alderne3^ 

 According to Sauvageau, Chorda filum descends as far south as Gigon 

 in Spain, but specimens have been found in the Mediterranean ; the 

 same writer also mentions the Corogne as the southern limit of 

 AcinetosiJora pusilla. Fucus serrafus is said by Harvey to extend 

 as far as Spain : it does not occur in the Mediterranean ; while 

 Crouan has noted that Tilo2)teris Mertensii ceases to appear beyond 

 the Spanish coasts. 



The following are some northern elements of the Atlantic Ocean 

 and the Norwegian Polar Sea which also exist in the Guernsey Flora : 

 those marked with an asterisk occur also in the Arctic Seas : — 



Bolhocoleon inliferum. 

 Rhizocloniiim riparlum* 

 Claclop liora glau ces cens. * 

 C. arcta* 



C. lanosa. 

 Desmarestia vlriclis.^ 



D. aculeaia* 



DictyosipJion foenicidaceus.^ 

 Lithosiphon Laminar ice. 

 Pun eta ria p la n tag in ea . * 

 Ectocarpas tomentosus. 



E. Lehdii. 



JPylaiella Uttoralis var. varia. 



Myriotrichiajiliformis. * 



ElacJiistea fucicola.^ 



Sphacelaria olivacea* 



S. cirrhosa* 



Myrionema reptans. 



Cordaria Jlayelliform is* 



Castagnea virescens, 



C. divaricata . 



Leathesia difformis. 



Chorda Jllum. 



Laminaria saccharina. 



L. digitata. 



L. Clotcstoni. 



Alaria esculenta. 



Fucus si^iralis. 

 F. vesiculosus. 

 F. serratus. 

 Ascophylhcm nodosum. 

 Pelveiia canaliculata. 

 Himanthalia lorea. 

 Forp hyra lacin ia ta . * 

 Chantransia virgatula and 

 var. secundata* 



C. Daviesii* 

 Gigartina stellata. 

 Fhyllophora meinbran ifolia. 

 Rhodymenia palmata* 

 Phycodrys rubens. 

 Delesseria sanguinea* 



D. alata. 



D. angustissima. 

 Polgsiphonia fihrillosa. 

 P. nigra. 



Callitdiamnion polyspermum. 

 C. Hoolceri. 

 Plumaria elegans. 

 Ceramium acanthonotum. 

 Polyides rotundus. 

 Petrocelis cruenta. 

 Epilithon memhraiiaceum. 



There is moreover in the Atlantic Flora an endemic Arctic element, 

 which, according to Kjellman, originated in a glacial sea and passed 



