12 



The Ericetum is found on somewhat wetter ground than the Cal- 

 luna formation; here also as a rule much Cladonia rangiferina is 

 intermixed. The accompanying plants just mentioned from the Calluna 

 moor are also characteristic of the Erica moor. The Erica formation 

 finely developed is often seen as a belt round about the bogs, the 

 ground nearest these becoming too wet for Calluna. Mixed forma- 

 tions of Calluna and Erica are frequent. The heather moor, where 

 Erica is dominant, is often visible from a long distance owing to the 

 fact, that Scirpus caespitosus, Juncus species, Eriophorum, Molinia and 



s 



Fig. 3. Sketch of Borris heath indicating the boundaries of different fires. 

 The arrow shows the orientation. In the north-west corner is seen a part of 

 Skjern Aa (river) near the village of Borris. The boundaries of the different 

 fires are indicated 'by different dotted lines, as also by figures; e. g. 69, 90, 

 93 etc. indicate the areas burnt in the years 1869, 1890, 1893; 90 93 thus 

 means the area burnt in the years 1890 and 1893 and so on. 



other glumiflores are present in quantities and give the formation a 

 light, yellowish green appearance. 



The Myricetum. At some places on the moor Myrica gale forms 

 dense, metre-high communities on old peaty soil; it may appear almost 

 pure or mixed with Erica, Calluna and the species mentioned above 

 under the Calluna moor. 



B. The formation of mosses and h e 1 o,p h y t e s 

 connected with the water. 



Scattered about the heather moor, especially towards the south, we 

 find basins which contain water, at any rate for a great part of the year. 



