126 Scientific Proceedings, Royal Dublin Society. 



*L, (P.) miniatula Nyl. — On quartzite rocks above high-tide mark on the 

 Sutton shore. This plant comes very near L. ninrorum subsp. tegularis 

 Nyl., differing from it chiefly in the deep tawny vermilion colour of the 

 thallus; in the Howth specimens of L. tegularis the crenulate margin of 

 the apothecium is a further difference. These differences hardly seem to 

 be specific, but, as Crombie has separated the two plants, I follow him 

 in the matter. 



fLecanora (Candelaria) vitellina Aeh. — Frequent on rocks, especially on the 

 east coast, the growths usually occurring as yellow lines in the fissures 

 and along the unevennesses of the rock-surfaces. 



tL. (C.) epixantha Nyl. — On rocks and on the ground. General on the south 

 and south-west coasts ; rare on the east coast. On a rocky substratum 

 this species is always fertile, but, when growing on the ground, the 

 thallus is thinner, more dispersed, and usually barren. In the Howth 

 specimens the spores are simple and often slightly curved, with the 

 cell-contents more or less concentrated at the ends, indicating their 

 polaribilocular character. No truly polaribilocular spores, however, were 

 seen in the specimens examined. The measurements 16-19^ x 5-7/u. agree 

 with Crombie's. L. epixantha is sometimes associated with L. vitellina, 

 and is not distinguishable from it in the field. Under the microscope, 

 however, they are easily separated by the 8-spored ascus of L. epixantha. 

 At I5ottle Quay L. epixantha grows on low rocks about high-water mark. 

 In specimens collected from this situation the thallus was completely 

 obscured by a dark algal growth (Gloeooapsa sp. ?), which gave the 

 lichen much the aspect of a Biatorina, with minute, pale yellow apothecia. 

 The only previous Irish record is from Giant's Stairs, Co. Cork. 

 Lecanora (Caloplaca) citrina Ach. — Abundant on sea-walls and rocks near 

 the villages of Howth and Sutton, and occasionally at other places round 

 the coast. 



*L. (C.) incrustans Ach. — On crumbling rocks, Broad Strand, associated with 

 L. Hageni; rare. 

 L. (C.) aurantiaca Nyl. — On an old wooden post, Earlscliffe; rare. 



fsubsp. erythrella Nyl. — Rocks and earthbanks, Glenaveeua ; rare. 



tL. (0.) ferruginea Nyl. — On rocks ; frequent. 



fvur. festiva Nyl. — On rocks in the Ramalina belt; common. 

 tL. (C.J caesiorufa Nyl. — On schistose rocks, and on stones at the base of the 

 earthbanks, Earlscliffe, Glenaveena, and White Water Brook; frequent. 

 tL. (C.) Turneriana Nyl. — White Water Brook ; rare. 



*L. (C.) albolutescens Nyl. — On calcareous soil, Glenaveena, amongst 

 tufts of Pottia Heimii associated with Dermatocarpon hepaticum and 



