Rev. W. A. Leighton on the Lichens of Cader Idris. 407 



which Dr. Nylander has named Lecidea rusticula, and thus 

 describes in the ' Flora/ 1866, p. 371 :— 



"Lecidea rusticula, Nyl. 



" Thallus albidus, granulis constans depressis subcrenatis ; 

 apothecia nigra, minuta (latit. 0*2 millim. vel parum amplius), 

 planiuscula (juniora obtuse marginata) ; sporse 8, incolores, 

 ellipsoidese, long. 0-010-0-015 millim., crass. 0-005-0'008 

 millim.; epithecium vage fuscescens; paraphyses baud dis- 

 cretse; hypothecium fuscum. Gelatina hymenea iodo intense 

 caerulescens, dein sordide lutescens. Sporis majoribus, thallo, 

 &c., differt a comparanda L, dispansa, Nyl. in ' Flora/ 1866, 

 p. 87." 



Lunched at the little roadside inn at Minfifordd, and retraced 

 my steps to Dolgelley for the night. 



I was now joined by my friend Dr. John Fraser, of Wolver- 

 hampton j and we essayed the ascent of Cader Idris by the lakes, 

 purposing to examine carefully the northern escarpment. We 

 had, however, scarcely surmounted the moraines before a beating 

 hailstorm and pelting rain chilled, benumbed, and wetted us to 

 the skin, compelling us to halt and seek shelter amid the boul- 

 ders. But, no abatement in the storm occurring, we were ob- 

 liged to descend and return home through the morass, which 

 (and even the turnpike road itself) was swimming with water 

 several inches deep. Our gatherings were necessarily trifling — 

 Parmelia conspersa, Ach., with spermogonia, Lecanora cervina, 

 Ach., var. rufovirescens, Tayl., and a few other species before 

 enumerated. The evening was spent in a walk to the famous 

 '^ Torrent Walk," which proved to my friend a very paradise of 

 mosses, but afforded nothing of any interest in lichens. 



Nothing daunted, we next day tried Cader Idris from the 

 north-west, purposing to traverse the summit eastward to Dol- 

 gelley, but were again beaten back by dense mists and drench- 

 ing rain, collecting nothing save Lecidea milliaria, Fr., f. sporis 

 subsimpHcibus, Lecidea flavovirescens, Mass., L, bacilliferay Nyl., 

 f. muscorum, L. coarctataj Ach., f. elachista, Ach., Lecanora ven- 

 tosa, Ach., thallo pallidiore, and Lecidea rivulosa, Ach. 



A fine day now tempted me (in the absence of my friend, who 

 went to Barmouth in search of mosses) to a stroll along the 

 Festiniog road, on the banks of the river flowing through this 

 most beautiful and picturesque valley. Here, on the stone 

 walls, roadsides, and trees, I met with Opegrapha saxatilis, DC, 

 Verrucaria ffcmmata, Ach., V, margacea, Whlnb., var. cethiobola, 

 Whlnb., V. rupestris, Schrad., V. chlorotica, Ach., V, nitida, 

 Schrad., Arthonia Schwartziana^ Ach., and A. epipasta, Ach., 



