Knowles — The Maritime and Marine Lichens of Hotvth. 127 



Biatorina coeruleonigricans. Crombie gives the habitat of this species 

 as " granitic rocks in upland tracts." The liabitat of the Howth plant 

 is very different ; but the specimens, although growing on the ground 

 and near the sea, agree in all particulars with Orombie's description of 

 L. albolutescens, and are identical in appearance with the specimens of 

 this species in his herbarium in the British Museum. The only British 

 records are from IST. England. • 



fL. (C.) pyracea Nyl. — On stones and schistose rooks at the foot of earth- 

 banks, Broad Strand, and at White Water Brook associated with L. exigua 

 and Physcia tenella ; rare. 



tL. (C.) vitellinula Nyl. — Limestone rocks, Balscadden Bay ; rare. 



tLecanora holophaea Nyl. — In crevices of rocks, and on the upturned edges of 

 strata at various places on the south and south-west coasts, and at High 

 Eoom Bed on the east coast ; rare. This species is frequently associated 

 with Ph. parietina, L. lobulata, and Rhizocarpon alboatrum on these 

 coasts. 



*L. leucospeirea Nyl. — This species was seen only on the earth-banks between 

 Sutton and the Baily Lighthouse. It is abundant, but often infertile. 

 At Earlscliffe it is associated with L. epixantha, Acarospora benedarensis, 

 and the small moss Phascum muticum. As a rule, in sunny situations, 

 the squamules are small and scattered, but in shade they form conspicuous, 

 pale, greenish-white patches, are better developed, and more irsually 

 fertile. L. leucospeirea is distinguished from L. holophaea chiefly by the 

 whiter, and more scattered thallus, and by the smaller spores, which, in 

 the Howth specimens, measure 10-12(U x 3ju. The only previous records 

 are from the Island of Jersey, where it is said to be very rare. 



fL. Ralfsii Cromb. — On the Needles, associated with L. prosechoides ; very 

 scarce. 



tL. spodomela Nyl. — On coarse quartzites at the base of the earth-banks, 

 Earlscliffe, and on the cliiis behind the Needles. Crombie describes 

 L. spodomela as having much the aspect of L. sophodes. The Howth 

 specimens might easily be mistaken for that species without a microscopic 

 examination. The spores are slightly narrower than Orombie's measure- 

 ments, being 10-16jux 5- 6/u, and are very rarely three-septate. 

 Lecanora (Einodina) sophodes Aoh., subsp. laevigata Nyl. — Frequent on 

 rocks. Broad Strand, and abundant on pebbles embedded in the cement 

 walls of an old boat-house on the shore ; also on sea-wall at Sutton. 

 L. (R.) exigua Nyl. — Frequent on rocks about high-water mark. 



f. demissa Stiz. — On rocks above high-water mark at Broad Strand 

 and Sutton. L. exigua is frequently associated with L. Hageni. L. exigua 



SOIENT. PBGC. B.D.S., VOL. XTV., NO. VI. T 



