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



tainous country, they can point the easier and readier way of 

 ascent and access. Moreover it is always well to have a com- 

 panion in the event of mists coming on, or for procuring imme- 

 diate assistance in case of a sprained or broken limb on the 

 rocks, since a person prevented from walking by such an accident 

 might remain for days even without anybody coming near him 

 or hearing his cries for aid. 



Next morning I took the coach and travelled through the 

 beautiful scenery of the estuary ten miles to Barmouth, encoun- 

 tering a fierce storm of hail and rain in transitu. This day's 

 collecting on the rocks immediately above and around Barmouth 

 yielded the following : — Spilonema paradoxuniy Born., in fruct. ; 

 Ephehe pubescens, Fr. ; Physcia erosa (Borr.) ; Lecanora cervina, 

 Ach., var. smaraffdula, sinopica, and simplex ; Lecidea stellulata, 

 Tayl.; Lecidea IcBvigata, Nyl. ; Pei'tusaria ceuthocarpa^ T. & B. ; 

 Lecidea enterochlora, Tayl.; Lecidea fuliginosay Tayl.; Opegrapha 

 Chevallieri, Leight. ; Lecanora epanora, Ach. 



Returning to Dolgelley by rail, I picked up on the trees near 

 Pen-maen-pool Lecidea bacillifera, Nyl. (new to Wales) . 



The following morning proving rainy, I wandered before 

 breakfast along the Bala road, and there, about one mile from 

 Dolgelley, gathered Sticta limbata, Sm., and fuliginosa, Dicks., 

 and on a Scotch fir by the roadside discovered a new species of 

 Opegrapha, which Dr. Nylander has thus named and charac- 

 terized in the ' Flora,' 1866, p. 374 :— 



" Opegrapha amphotera, Nyl. 



" Similis 0. varia f. diaphorce, apotheciis sat confertis; sed sporse 

 tenuiores (long. 0-030-0-035 millim., crassit. 0-0035-0-0045 

 millim.), septis 5-9 (vel ssepius indistinctis) . Hybrida quasi 

 inter O. variam et vulgatam." 



After breakfast, the weather clearing up a little, I took an 

 unfrequented road across the base of the eastern spur of Cader 

 Idris to the Cross Foxes on the Tal-y-llyn road, and on the 

 stone walls there gathered Lecidea lucida, Ach., in magnificent 

 and abundant fructification, Lecidea sabuletorum, var. milliaria, 

 with fine and plentiful spermogonia on the mosses, Pannaria 

 muscorum (Ach.) in fruit, Leptogium muscicolum, Fr., Stereo- 

 caulon denudatum, Flk., with magnificent cephalodia. Proceed- 

 ing onwards to a little tarn on the roadside, Llyn Trigraienyn, 

 the fine view of the whole pass, with the lake Tal-y-llyn, bursts 

 on the sight — so beautiful as not soon to be forgotten. Close 

 to the tarn are the " Giant's Pebbles," on which I found Cetraria 

 aculeata, Ehrh., Alectoria bicolor, Ehrh., Platysma sapincolum, 

 Hoffm., and a new species of Lecidea, in very small quantity. 



