136 Scientific Proceedings, Royal Dublin Society. 



Tribe GRAPHIDEI. 



fArthonia punctiformis Ach. — On Blackthorns, Earlscliife ; rare. The only 



previous Irish records are from Co. Gralway. 

 fA. paralia Nyl. — Here and there on the Harbour wall associated with 

 Placodiitm muronmi ; rare. The only previous record is Cleggan, 

 Co. Galway. 

 A. varians Nyl. — Abundant all round the coast on the apothecia of Lecanora 

 prosechoides. The only previous Irisli record is from Lambay Island, 

 Co. Dublin. 

 fA. subvarians Nyl. — Frequent on Lecanora galacUna. The only previous 

 Irish record is Castlebar, Co. Mayo. 

 Opegrapha atra Pers. — On Blackthorns, EarlsclifEe. 



0. saxicola Ach. — Broad Strand, associated with Buellin stellulata ; frequent, 

 fvar. DecandoUei Stiz. f. clarescens A. L. Sm. — On rocks above Casana, 

 and on the Nose of Howth ; rare. 

 to. calcarea Turn. — On grits and quartzites in the Hamalina belt all round 

 the coast (see page 100). 



f. heteromorpha A. L. Sm. — General and usually found nearer the 

 sea than the species. 

 to. confluens Stiz. — Only noted on the east coast ; rare. 



tGrapMna Ruiziana Muell.-Arg. — On Blackthorns and on dead wood, Earls- 

 clifle ; rare. This species is usual on the surface of the wood wliere 

 branches liave been snapped off at right angles. The thallus is whitish, 

 and the apothecia occur in prominent broken lines radiating from pith to 

 bark. The spores of the Howth specimens are slightly smaller than the 

 measurements in vol. II of the " Monograph of British Lichens," being 

 24-35/x X 9-15;u. 



Tribe PYRENOCAEPEI. 



tDermatocarpon hepaticum Th. Fr. — Very abundant on the earth-cliffs at 

 Glenaveeiia, associiited with Biatonna coeruleonigricans, &c. (see page 120). 

 Verrucaria maura Wahlenb. — On rocks above high neap-tide level ; very 

 common. 



*var. aractina Wahlenb. — In sunny situations and at higher levels 



than the species ; Broad Strand, 

 tvar. memnonia Koerb. — In shade at a lower level than the species 

 common round the coast. 

 v. mucosa Wahlenb. — On rocks inside neap-range; common. This species 

 is recorded from stones in the beds of streams on the Frencli coast. 



