32 The Irish Naturalist. February, 



Yorkshire. Mr. Holmes found it on shells on the sea-shore. 

 At Cleggan it is very abundant both on live and dead 

 barnacles and almost always associated with colonies of 

 Rivularia atra. It is a perforating lichen and is very easily 

 overlooked, its thallus and very minute perithecia being 

 embedded in the substance of the shell, the latter appearing 

 at the surface as very minute black dots. I have collected 

 it at various other places round the coast of Ireland and 

 expect it is much more common than it is generally thought 

 to be. I have found it only on barnacles. 



On old walls south of the village, Lecanora parella, various 

 Physcias, and Parmelias, flourished exceedingly. Among 

 the Parmelias P. caperata, P. Borreri and P. ciliata are new 

 records for Ci, while Parmelia revoluta and P. laevigata found 

 chiefly on the shady sides of the walls have been noted 

 only from one other locality in this district. 



There are two small outcrops of limestone in the neigh- 

 bourhood of Cleggan, one close to the bay and the other 

 further inland at Ballynakill Lake. Some of the specimens I 

 got at Ballynakill have proved very interesting, one of them, 

 PolyUastia Schraderi, being new to Ireland, and like the 

 other species new to Ireland which I record, it has a very 

 limited distribution in England. On the same rocks Lecidea 

 immersa, L. Metzleri, Verrucaria calciseda, and Biatorina 

 episema^ parasitic on the thallus of Lecanora calcarea, were 

 abundant. 



During my stay at Cleggan we made an expedition to 

 High Island and spent a couple of hours there. This island 

 is accessible only in the very calmest weather. The chief 

 part of my time was taken up making a list of the Flowering 

 Plants but several Lichens were also noted. One of them, 

 Physcia flavicans, has its only other station in the west of 

 Ireland on the Blasket Islands off the coast of Kerry. It 

 grew sparingly at the foot of some rocks among moss on 

 the south-west part of the island. The remarkable feature 

 of the Lichens on High Island was the abundance of 

 Ramalina Curnowii. It covered almost every rock with its 

 tufts, and caused them to stand out conspicuously from the 

 sward, which was eaten as smooth as a table by the numerous 

 sheepi that had been turned on the island. 



