30 Floristik, Geographie, Systematik etc. 



Chap. IV. The Plant-Formations. This chapter contains a 

 description of the different plant-formations occurring on the Fa- 

 röes. It is pointed out that in an insular climate and with an irre- 

 gulär configuration of the surface it is difficult to give a definite 

 picture of the plant-associations, as they merge gradually into each 

 other and are liable to frequent change. On the Faröes most of 

 the plant-associations are closely related, and the distinctions between 

 them depend on small differences, difficult to maintain. 



The groups of the Classification are the following: 



A. Natural formations. 



1. Halophile formations. 



a. The sandstrand formation: Honckenya assocation, Elxmus 



association. 



b. The sand-dune formation: Psamma association. 



c. The salt-marsh formation: Atropis association, Carex salina 



assoc, Plantago maritima assoc. 



d. The coast-cliff formation: Ramalina assoc, Grimmia-Weissia 



assoc, Haloscias assoc. 



2. Subalpine formations. 



a. The plankton-formation. 



b. The freshwater lithophyte form: Cladophora assoc, Entero- 



morpha assoc 

 c The limnae-formation of the lakes: Litorella assoc, Sparga- 

 ninm- Potamogeton assoc. 



d. The limnae-form of running water. 



e. The hydrophyte form round spring and streamlets: Philono- 



tis assoc, Amphibious assoc. 



/. The swamp formation: Heleocharis assoc, Menyanthes-Poly- 

 gonifolius assoc. 



g. The moor formation : Boggy sedge-moor assoc (Cyperaceae- 

 Sphagnum assoc), Grass-moor assoc. {Glumißor-Hylocomium 

 assoc) with Nardus facies, Juncus squarrosus facies and 

 Scirpus caespitosus facies. 



h. The heather-moor formation (moist Calluna heath): Calluna- 

 Erica cinerea assoc 



i. The grass slope formation: Carex binervis, Lusida silvatica 

 assoc, Anthoxanthum-Agrostis vulgaris assoc. with Agrostis 

 vulgaris facies and Anthoxanthum facies. 



/ The cliff Vegetation: The lithophyte formation. The typical 

 chromophyte formation. The ombrophile chromophyte for- 

 mation. The thermophile chromophyte formation. 



3. Alpine formations. 



a. The rocky-flat formation. 



b. The alpine bog formation: Eriophora- Carex pidla assoc. 



c. The Grimmia heath formation. 



c*. Transition from Grimmia heath to grass-moor (transition for- 

 mation). 



4. The Vegetation of the sea-fowl cliffs. 



B. Formations in the cultivated area. 



a. The BöTormation (Grass-meadow). 

 «*. The roof Vegetation. 



b. The com and potato fields, together with the weed-vegetation 



in the gardens and around the houses (Ruderal Vegetation). 



c. Metamorphic formation. 



The most common formations are the moor form. (A. 2.g), the 

 heather moor form. (A.2.h), the cliff Vegetation (A. 2./), the rocky- 



