134 Scientific Proceedings^ Royal Dublin Society. 



localit}', being near sea-level, is an interesting extension of the range of 

 this species. 

 Bilimbia aromatica Jatta. — Frequent on sea-walls about Sutton and Howth ; 

 in crevices of rocks at various places round the coast, and on calcareous 

 soil at Glenaveena. 

 B. melaena Arnold. — On peaty soil, Old Boat-house and Lion's Head ; rare. 

 Bacidia muscorum Mudd. — Here and there amongst tufts of the moss Pottia 

 Heiiiiii, on the earth-banks and at Glenaveena; rare. 



fB. umbrina Branth. & Rosti-. — On the earth-banks, Earlsclifle, associated 

 with Biatorina contristans and Lecanora epixantha; frequent. 

 Buellia canescens De Not. — In shady places, all round the coast ; common. 



fB. spuria Koerb. — On dry sunny cliffs near the Needles, and on stones at 

 the base of the cliffs, Bi'oad Strand ; rare. 



fB. myriocarpa Mudd. — Common all round the coast, very plentiful on the 

 rocks lying at the foot of the cliffs. Broad Strand. At Earlsclifle it is 

 equally abundant on rock, bark, and soil, and covers the surface of dead 

 twigs and stems of grasses lying on the ground (see page 118). The 

 form leprosa is most usual on the soil, and forms areolata, ecrustacea, and 

 opegrapliina were all noted on rocks on the Broad Strand. 



*B. Schaereri De Not. — On tlie ground and on chips of rock lying on the 

 surface of the earth-banks. Broad Strand, associated with the above, 

 wliich it closely resembles, but from which it is distinguished by the 

 smaller and more distinctly margined apothecia, the concrete paraphyses, 

 and by the smaller and paler-coloured spores, which in the Howth 

 specimens measure consistently 8-10/x x 4ju ; common. 



fB. aethalea Th. Fr. — On schistose rocks on the shore, Broad Strand ; rare. 



fB. verruculosa Mudd. — Frequent round the coast on dry sunny rocks, but 

 nowhere plentiful. 



fB. saxatilis Koerb. — On small stones, Earlscliffe, and on schistose rocks near 

 the Needles ; scarce. 



*B. ryssolea A. L. Sm. — A very common species, especially on the south and 

 south-west coasts, on rooks in shady places, often covering many square 

 yards of the surface with a close grey map-like growth, very similar in 

 appearance to that of Lecidea rivulosa, but rather paler in colour. The 

 Howtli specimens vary a little from the description in the " Monograph 

 of British Lichens," the spores being slightly constricted at the septum. 

 The only previous record for this species is from south-west Wales, 

 where it grows on the Caradoc sandstones. 



fB. stellulata Mudd. — On rocks and stones ; common. 



*B. impressula A. L. Sm. — On slaty rooks on the east coast ; rare. I have not 



