1913-14.] BOTANICAL SOCIETY OF EDINBURGH 253 



Equisetv/m arvense, Linn.: and Arrhenatherum avena- 



ceum, Beauv. 



2. Rocks. — The rocks at the Point consist chiefly of 

 basalt dykes and schistose limestone, together with 

 boulders and loose pieces of stone too coarse to be in- 

 cluded under the term " shingle." Here are to be found 

 such succulent petrophytes as v maritima, Dumorfc. ; 

 Spergularia media, Pers. : in addition to the commoner 

 Gochlearia officvtuilis, Linn.: Plantago maritima, linn. - 

 and Sedum anglicwm, Hud'-. 



At the lighthouse the coast-line bends sharply towards 

 the north, and the rocks above mentioned give way to Old 

 Red Sandstone conglomerates which persist with occa- 

 sional intrusive dykes, and interrupting stretches of shingle, 

 as far as the Toward and Innellan boundary. Here, as on 

 the lochside, one finds Sagina procv/mbens, Linn., and 

 ■ i. Linn., associated with the rock plants. 

 Where the rocks extend back inland without intervening 

 shingle, a short close turf forms the bordering vegetation 

 containing: Lotuscor -\ Linn. : Thymus SerpyUv/m, 



Linn.: and Galium verum, Linn. 



3. Salt-Marshes. — Along this part of the coast, where 

 the Red Sandstone occurs, the salt-marsh formation is 

 frequently seen in the form of little round tussocks, 

 isolated or in groups. The occurrence, in addition, of con- 

 siderable stretches of the same formation, suggests the 

 gradual extension of colonies of plants which first obtained 

 a hold as isolated individuals. The formation contains the 

 same plants as the salt-marshes of the lochside: i.e. Glaux 

 maritima, Linn.: Jv/ncus articulatus, Linn.; J. Gerard' . 

 Loisel. : Armeria maritima, Willd. ; and Agrostis alba, 

 Linn. ; but in addition to these, quantities of Aster Tri- 

 'polium, Linn.: Triglochin ma/ritimum y TAxm. ; and Glyceria 

 maritima, Wahlb., are also found. 



Glyceria maritima occurs in large patches at the Point, 

 and frequently extends below high-water mark mixed with 

 detached pieces of sea-weed. Arenaria peploides, Linn.. 

 is often seen in great mats by itself, as well as being 

 associated with the marsh or shingle plants. 



Adaptations.— Among the species which have been 

 enumerated, numerous examples are to be found of the 



