£ 2 [Proc. B.N.F.C, 



were the most abundant species on the rocks up to 2,000 feet. 

 At about 2,000 feet and above that level three other species, 

 Parmelia tristis y Gyrophora cylindrica, and Lecanora haematoma 

 were occasionally met with. So far as their present distribution 

 is known these last three species are rare in Ireland, and are 

 confined to mountainous districts, Parmelia tristis being known 

 from one other locality only, viz., Dunkerron, Co. Kerry. 



The Lichens growing on the basaltic rocks of Benevenagh 

 seemed to be less luxuriant and less often fertile than those on 

 the granites of Slieve Donard. Rhizocarpon geographicum was 

 not noticed on Benevenagh but it occurred on the coarser 

 grained basalts of Fair Head. At the Giant's Causeway the belts 

 and zones of the coastal Lichens were seen to occur in the same 

 succession as at Howth, County Dublin, the belt of Orange 

 Lichens composed of Physcia parietina, Placodium murorum, 

 and P. lobulatum being very conspicuous and well developed. 

 The two Lichina zones were also very clearly seen on the Cause- 

 way itself. 



At Whitepark Bay some very rare and interesting calcicole 

 Lichens were found both on the chalk rocks of the shore 

 and on pebbles and small pieces of the same rock that were 

 scattered about on the Neolithic middens on the sandhills. The 

 most interesting of these were Opegrapha Leightonii, Acrocordia 

 epipolaea, Arthonia lapidicola, Polyblastia Schraderi, P. deminnta, 

 and Lecanora pruinosa var. immersa. The first two species were 

 amongst a number of Lichens collected by Mr. James Glover 

 during the excursion, which he sent to me for identification ; the 

 two Polyblastias were found in material brought from Whitepark 

 Bay by Mr. R. LI. Praeger, in August, 191 2. 



The list of species given below contains only those that 

 are new to districts Ui and U2 of Mr. Adams' sub-divisions 

 of Ireland. 



