Praeger — On Types of Distribution in the Irish Flora. 17 



elevated and broken ground formed of non-calcareous rocks around 

 the margin. The actual distribution of limestone is shown in black 

 on the following map (fig. 9). Let us compare this with the distri- 

 bution of lime-loving and lime-avoiding plants. 



Fig. 9. — Actual distribution of Carboniferous limftstone. 



The data are at hand. Mr. Colgan has paid much attention to 

 these soil-relations in Ireland, and has compared his results with those 

 obtained in France ; in the second edition of " Cybele Hibernica " he 

 indicates the calcicole and calcifuge species, using three grades 

 (A, B, C) for each, according to their degree of preference for a 

 limy soil or soil free from lime, "A" indicating the most marked 

 preference in either case. 



The calcicole plants of "Cybele" range as follows: — 

 Calcicole A. 



Geranium lucidum. 

 Potentilla fruticosa 

 Galium sylvestre. 

 CarKna vulgaris. 

 Gentiana vema. 



K.I.A. PROC, VOL. VIII., SEC. B.] 



Calamintha officinalis. 

 Galeopsis Ladanum. 

 Orcliis pyramidalis. 

 Ophi'ys apifera. 

 Sesleria caerulea. 



