081 



quinqucdenlata, Lejeunea patens, Radula commutata, Plagiochia asplen- 

 ioides, Fegatella conica, Astrophylliim horniim, A. Seligeri, Glj'phomi- 

 triuni polyphylhim, Weissia niaritima, Polytrichum juniperinum, Grimmia 

 gracilis, G. fascicularis, Hypnum sericeum, H. Stockesii, PlagioUiccium 

 undulatum, Isothecium myosuroides, I. viviparum, Slereodon rcsupinatum, 

 Tliyidium tamariscifolium. 



The mosses as well as the higher piants convey the same im- 

 pression, they are a very mixed and heterogeneous company, and 



lig'. ISCi. »Ur oii tlie eastern side of Nolso. (From photo. by E. Warming), 



conform to the irregularities of their habitat, where some piaces 

 are dry and warm while olhers are humid and cold. 



(4.) The vegetation of the south-exposed »Hamre« 

 (rock-led ges) is not so rich as that just described. The chief 

 difference is, that on the dry »Hammer« the mosses occur neither 

 in snch masses nor as so many species, because the light is too 

 strong and the water-content of the soil too scanty for them. The 

 higher piants which prefer shade and moisture are also absent and 

 their piaces are taken by other more xerophile species. 



The dry, south-exposed »Hamre« occur in all the islands from 

 the lower regions upwards to the highest mountains, but as might 

 be expected, the constituents of the vegetation vary somewhat 

 according to the altitude above sea-level. 



63* 



