i38 Scientific Proceedings, Royal Dublin Society. 



V. striatula and V. microspora are often associated, and the two 

 species are sometimes confused. V. tnicronpora, however, may be easily 

 distinguished by the hemispherical perithecia, which are not depressed 

 at the top, but open by a small pore, and by the slightly larger elliptical 

 spores, which measure 9-10/x x 4-5 /z. 



*V. scotina Wedd. — Specimens which may be referred to this species were 

 collected in tlie upper part of the V. maura belt at Drumleck Point, Old 

 Boat-house, and on Ireland's Eye. The main characteristics and those 

 which distinguish V. scotina from V. maura, with which it is associated 

 at these places, seem to be the large prominent conical or hemispherical 

 perithecia and the entire or sub-entire perithecial wall. The spores of 

 the two species are very similar. In the specimens referred to V. scotina 

 from Drumleck Point the thallus is almost evanescent. In those from 

 Ireland's Eye and Old Boat-house the thallus is thick, black, somewhat 

 cracked and areolate. 



fV. aquatilis Mudd. — Plentiful at several places round the coast where fresh 

 water flows and on the Harbour wall. The spores are sometimes 

 slightly longer than the measurements given in the "Monograph of 

 British Lichens," being 8-10/i x 5-7/x. 

 v. nigrescens Pers. — On rocks and stones lying above high- water mark. 

 Broad Strand, associated with Buellia coUudens and Lecanora simplex 

 f. strepsodina ; on the rocky cliffs at White Water Brook and on rocks 

 at Martello Tower, Sutton ; common. 



fV. murina Leight. — On rocks, White Water Brook ; rare. 



* var. pusilla Arn. — Only seen on cliffs at Hippy Hole, where it was 



abundant with Opegrapha calcarea. 



tV. prominula Nyl. — At Worn Hole and on shady rocks on the south side 

 of Balscaddeu Bay, associated with Arthopyrenia halodytes and V. 

 memnonia. 



fvar. viridans Nyl. — Occasionally found with the species. 

 V. rupestris Schrad. — On rocks and stones lying above high- water mark, 

 Broad Strand ; frequent. 



*VERIIUCARIA LORKAIN-SMITHII Nov. Sp.>— Thallus blackish-green, 

 gelatinous, thin, continuous, or sometimes almost evanescent ; perithecia 

 excessively minute, about 120-180 ^ in diam., only visible with a power- 

 ful lens, scattered, hemispherical, shining, opening by a very minute 



1 Thallus nigrovirescens, gelatinosus, tenuissimus interdum evanescens ; perithecia dispersa, 



minutissima, aterrima, lucida, hemisphaerica, dimidiata, circa 120-180 |U diam.; apice ostiolo 



minutissimo, 15-20 /t diam.; paraphysibus obsoletis ; ascus ellipticus, 20-25 |U x 10-12 /i; sporis 



S-nis, semper simplioibus, oblongo-elongatis, anguatioribus, rectisvelleviter curvatis 15-18^ x 2-4^. 



id saxa calcaria in locia inter aestus miniiiios et masimos nascens. 



