408 Rev. W. A. Leighton on the Lichens of Cade?' Idris. 



Lecidea stellulata, Tayl., L. chalybeia, Borr., L. (Ederij Ach., 

 L. vernalis, Fr.^, L. sabuletorum, Flk., states of Lecanora cinerea 

 (L.), L. calva (Dicks.), L, pyracea, Ach., and L. aurantiaca 

 (Lightf.)_, and L. galactma^ Ach., Lecanora sophodes, Ach., forma 

 virescens, Baeomyces icmadophilus (Ach.), and a new Sphceria 

 growing parasitically on the thallus of Lecanora tartar ea or its 

 variety pallescens, and which Dr. Nylander, to whom I submitted 

 it, proposes to name Sphceria tartaricola, Nyl. 



Our last day was devoted to the east end of the range, about 

 Llyn Aran, and was a glorious one. This portion seems but 

 little frequented ; for we here observed Saxifraga nivalis (L.), 

 Oxyria reniformis (Hook.), Sedum Rhodiola (DC), Thalictrum 

 minus (L.), Asplenium viride (Huds.), Cystea dentata, Sm., &c. 



My lichen-gatherings were: — Stereocaulon cereo/w5,Borr., abun- 

 dant and in fine fructification, and with pycnides ; Stereocaulon 

 denudatum, Flk., scarce; Lecidea pantsola, Ach. (new to Eng- 

 land), L. excentrictty Ach. (new to Great Britain), L, phaops, 

 Nyl. (new to Great Britain); Abrothallus TVelwitschii, Tul.; 

 Lecanora leucophaa, Flk., abundant; L. irrubata, Ach.; L. mu- 

 rorum, Hff"m., var. obliteratum, Pers. ; Normandina pulchella 

 (Borr.); Endococcus gemmifer, Tayl.; Verrucaria Sprucei, Leight.; 

 V. mesotropa, Nyl., n. sp. ; and Lecidea advertens, Nyl., n. sp. 

 The two latter are thus described by Dr. Nylander in the ' Flora,' 

 1866, p. 419 :— 



a Yerrucaria mesotropa, Nyl. 



"Thallus pallidus, tenuis, insequalis; apothecia nigra, turgidula; 

 perithecio convexo, dimidiatim nigro (latit. 0*15-0*20 millim.), 

 epithecio vix distincto ; sporae 8, incolores, ovoidese vel ovoideo- 

 oblongse, 1-septatse (vel septo spurio), long 0'012-0017 mil- 

 lim., crass. 0'005-0'006 millim.; paraphyses nullse. Gela- 

 tina hymenea iodo vinose rubens. Affinis videtur V, super- 

 positm. Gonidia viridia (latit. 0*004-0006 millim.), ssepe 

 oblonga." 



"Lecidea advert ens, Nyl. 



"Thallus olivaceo-nigricans, tenuis, subfurfurellus, indetermi- 

 natus; apothecia nigra, minuta (latit. 02-0*3 millim.), de- 

 mum convexiuscula, immarginata, intus concoloria ; sporse 8, 

 incolores, ellipsoidese, longit. 0*011-0'014 millim., crassit. 

 0'007-0'009 millim. ; epithecium sordide caerulescens : para- 

 physes non discretse; hypothecium nigrum vel fusco-nigrum. 

 Gelatina hymenea iodo cserulescens. 



" Facie Spilonematis revertentis, sed thallo tenuiore texturaque 

 omnino alia, scilicet gonidia. Thallus gonidiis constans chroo- 

 lepoidee concatenatis, filamenta sistentibus articulata (crassit. 

 0*014-0*018 millim.), chlorophyllo viridi in cavitatibus rotun- 



