22 



Festuca arumlinacea, Poa compressa, Cynosurus cristatus, Polygala 

 vulgaris, Fragaria vesca, Linum catharticum, Phleum Boehmeri, Helian- 

 themum chamcecistus, Lotus corniculatus, Trifolium arvense, Filipendula 

 hexapetala. In spring a quantity of mainly annual species appear 

 on these slopes (a therophytic, spring a s p e c t) , e. g. species of 

 Myosotis, Erophila verna, Teesdalea, Stenophragma thalianum, Alsine 

 viscosa (only on M0en), Holosteum umbellatum, Cerastium semidecan- 

 drum, Aira praecox, A. caryophyllea, Saxifraga tridactylites, and in ad- 

 dition the perennial species Potentilla minor, Saxifraga graniilata, An- 

 thoxanthum, Arabis arenosa and others. 



On the gradation from scrub to open slope we meet with plants 

 such as Lithospermum officinale, Orchis ustulatus, O. maculatus, O. 

 purpureus, Anacamptis, Picris hieracioides, Hypericum montanum, Tri- 

 folium pratense (in a specially hairy form), Botrychium Lunaria, Pla- 

 tanthera etc. 



The large number of names, to which many others could be added, 

 show best what a variegated plant vegetation occurs both in the scrub 

 and on the open slopes. The ecology of these associations is still but 

 little known; it is to be hoped, that future investigations will lead to 

 a more ecological subdivision, for the present \ve must be content with 

 the purely physiognomical 1 . 



4. The lithophilous vegetation on the chalk cliffs is 

 quite inconsiderable. The steep, bare surface of the cliffs is in general 

 naked and if any vegetation occurs, it is only insignificant algae (e. g. 

 Gongrosira Debaryanum, Stichococcus bacillaris, TrentepohHa aurea, 

 diatoms and a few Myxophyceae) and the small moss Seligeria calcarea. 

 Cracks and fissures are not formed in the comparatively soft chalk and 

 there is thus no place for higher plants (Chomophytes). Where such 

 occur on ledges and slopes, they are only small out-runners from the 

 vegetation of the wood, scrub or slope. Ledges and slopes occur mainly 

 in the lower part of the cliffs and at the foot, produced by the sliding 

 down of the chalk mould. 



5. The narrow strand region (sand) ,- which lies off the foot 

 of the cliffs, is usually quite devoid of vegetation. Here and there 

 however, we find a few individuals of a poor sand -beach ve- 

 getation such as Cakile, Salsola kali, Atriplex littoralis, A. hastata 

 and more occasional guests, as Tussilago farfarus, Festuca arundinacea 

 etc. - 



The number of species of vascular plants on H0je M0en is stated 

 to be 578 (Rostrup). - 



Short notes on the vegetation of M0en are to be found inBotanisk 



1 It has some resemblance to the chalk scrub and grassland associations of 

 South England (cf. Tansley, Types of British Vegetation, pp. 171 181). 



