I04 DR. J. W. -HESlOP HARRISON ON 



Crepis paludosa f Phraginitis vulgaris la 



Bidens tripartita r Phalaris arundinacea / 



Achillea ptarmica , f Briza media , . o 



Cnicus palustris o Holcus lanatus a 



Centaurea nigra f Deschampsia caespitosa f 



Pulicaria dysenterica la Agrostis alba a 



Eupatorium cannabinum la Molinia caerulea la 



Myosotis caespitosa /" Equisetum spp o 



Prunella vulgaris /' Aulacomnium palustre o 



Mentha aquatica a Hypnum cuspidatum a 



Vicia cracca a Hypnum praelongum / 



Lotus uliginosus f Fissidens adiantoides /" 



Lathyrus pratensis f F. bryoides / 



Trifolium spp /" 



The Eastern Half of the Lotuer Marsh. 



Necessarily, much damper conditions control the situation 

 here, and more open vegetation prevails. Furthermore, 

 monocotyledons reassert their real dominancy, and although 

 in actual species, either monocotyledonous or dicotyledonous, 

 no great differences are seen, the former occur in much 

 superior percentages to those of the upper marsh. Even in 

 the case of the dicotyledons their relative proportions are 

 greatly changed. 



Locally, vv^etter depressions occur which, offering even 

 damper habitats than the marsh generally, secure a different 

 class of tenant. One, in particular, contains much Hypnum^ 

 and there Trollius fails at once, so that a definite Hypno- 

 caricetum dominated by Hypnum cuspidatum and Carex 

 gracilis is formed. 



To the east of this. Spiraea is very common, but to the west 

 Trollius enjoys the dominant position. It must be noted 

 as a valuable fact that, wherever these collide and battle for 

 supremacy, then Spiraea ousts the Trollius. Just north-west 

 of the Phalaris island described above, the ground rises 

 slightly and harbours a colony of moles, which considerably 

 lighten the soil. Here Trollius revels, and crowds of seedlings 

 grow vigorously in the happy environment. 



Over the whole of this marsh Orchis incarnata replaces 

 Gymnadenia and Orchis maculata, being much more tolerant 



