20 



Proceedings of the Royal Irish Academy. 



Calcifuge A — continued. 



Calluna vulgaris. 

 Erica TetraUx. 



cinerea. 

 Microeala filiformis. 

 DigitaKs purpurea. 

 Scutellaria minor. 

 Polygonum Hydropiper. 

 Eumex Acetosella. 

 Kartliecium ossifragum. 

 Juncus squarrosus. 



supinus. 



Potamogeton polygonifoliiis. 

 Scirpus caespitosus. 



fluitans. 

 Carex piLulifera. 



binervis. 

 Deschampsia flexuosa. 

 I\'ardus stricta. 

 Blechnum Spicant. 

 Athyrium FiHx-faemina. 

 Lastrea dilatata. 

 Osmunda reo-alis. 



Total 46. The group reaches its maximum in KeiTj and "West 

 Cork -vrith 44 species, minimum in "Westmeath with 26 species. 



Fig. II. — Distribution of calcifuge plan 



It will be noted that calcifuge plants are more widely spread 

 than calcicole. Not only is the scale somewhat higher than that 

 of the calcicole group, being 56 to 95 per cent, of the group, as 

 against 38 to^'_95 per cent., but the number of high percentages is 

 much gi-eater, even though we are dealing with only the most 

 strongly calcifuge species. The reason is clearly to be seen in the 

 fact that non-calcareous soils are to be foxind in limestone areas, both 

 on account of the washing-out process referred to, and by reason of 



