■é 



945 



As related to the Philonotis association I take a plant-association 

 which has its home on the bare gravelly margins of lakes, water- 

 courses, etc. (see Fig. 9 in Vol. I, p. 15). Prof. Warming has verb- 

 ally proposed to me the name »Amphibious association«. Its 

 characteristic conditions are the great changes in the amount of 

 water; in the winter and early spring the piaces where it occurs 

 are submerged from the lake or watercourse or by some temporary 



Fig. 178. Small pool with Meiujantkes near Næs parsonage on Ostero. 

 (From photo. by E. Warming). 



lodgment of water; in the summer the piaces are exposed to the 

 air and the sun (see foot-note p. 937). The piants occurring under 

 those conditions are naturally short-lived, the commoner species 

 being Montia lamprosperma (in its small annual form), Sagina pro- 

 cumbens, Sedum villosiim, Koenigia, Juncus supinus, while Polygoniim 

 aviculare and Poa annua are not uncommon; mosses and lichens 

 do not occur. I have met this association in many piaces, but 

 have only a few notes on its composition. 



Examples 9 and 10 of the limnæ formation of the lakes include 

 piants from the amphibious association (p. 941). 



f. The swamp formation. 

 Swamp vegetation plays a minor part on the Færoes, because 

 the configuration and the small extent of the islands do not favour 



