— 276 - 



south. The reef is a part of an interlobate moraine, which has 

 its continuation in a little peninsula, which from the southern 

 border of the lake stretches forward towards the island. The water 

 between this peninsula and the island is low. 



The low area surrounded by the reef has by and by been 

 filled up with peat, and in this manner the island has been formed. 

 On the bottom of the lake round the island are growing Lobelia 

 Dortmanna and Myriophyllum spicatum. In the low water to the 

 south of the island is found a broad but sparsely sown reed- 

 swamp. Next to the coast Car ex rostrata is prevailing. Besides 

 this Naumburgia thyrsiflora, Equisetum limosum, Scirpus lacustris, 

 Phragmites communis, Lobelia Dortmanna and a single sample of 

 Alis ma Plantago are found. In a little deeper water the swamp 

 is mostly formed by Phragmites, Scirpus and Equisetum, which 

 partly grow together, partly form small pure associations. Among 

 the reeds Lobelia and a few samples of Potamogeton natans and 

 Polygonum amphibium are found. 



Table I. 



Nanophanerophytes 83 



Alnus glutinosa 27 



Rhamnus frangula 16 



Myrica gale 40 



(Jhamæphytes 23 



Aira flexuosa 23 



Hemicryptopliytes 163 



Spiræa ulmaria 5 



Lythrum salicaria 7 



Peuoedanum palustre 5 



Molinia caerulea 31 



Agrostis alba 5 



Thalictrum flavum 40 



Lysimachia vulgaris 36 



Rubus idæus 11 



Galium palustre 2 



Lycopus europæus 5 



Mentha arvensis 3 



Viola palustris 7 



Geopliytes 2 



Majanthemum bifolium 2 



Points 271 



diageic 152 



epigeic 76 



Along the eastern coast of the island the reed-swamp conti- 

 nues but in a narrower belt, as the bottom is declining much 

 steeper to the outward. Next to the coast grows Naumburgia 

 thyrsiflora, farther outwards Equisetum, Phragmites and Heleocharis 

 palustris. On the western coast is found on a single spot a small 

 group of Heleocharis. Except this there is no reed-swamp on the 

 western and northern coast, apparently owing to the prevailing 

 western and north-western winds, which make the lake-bottom 

 less undisturbed during winter and autumn. 



The reed-swamp has to be characterised as a formation of 

 diageic herbs, defoliating during the winter. According 



