LLANBERIS LTCUENS 15 



*Bilimbia cambrica, sp. nov. Thallus indetenninatus granulato- 

 squamulosus vel sqnamulosiis, squamiilis contigiiis vel dispersis Havido- 

 cinereis, marginis promiiierites pallidioribus. Apotliecia nigra priino 

 plana marginata deinde convexa imniarginata et ajtate tuberculata, 

 saepe conglomerata. Epithecium in plagas tenues dissectum brunneuni! 

 Hjpotliecium saturate nigro-fuscum. Parapbyses bene discret^e 

 subcapitatie graciles, apieibus f useescentibus. Spori 24- :3G x 5-7 u 

 fusifornies 3-septatie. 



Thallus yellowish gre}^ subeffuse, squamulose, squamules roundish 

 and nodulose or larger and irregularly Hexuose, adnate, depressed in 

 the centre, whitish at the elevated margins, scattered or congregate. 

 Apothecia rather small, black, opaque, scattei-ed or several together, 

 in age convex and tuberculate with the margin excluded. Epitliecium 

 brown in section ; hypothecium black, becoming brown upwards. 

 Paraphyses slender, subcapitate. Spores fusiform, 3-5 septate ; 

 24-36 X 5-7 /.{. On rocks of volcanic ash on Snowdon, above 3U(jO ft. 

 This lichen is very near Bilimbia leucojjhfsoj^sis A. L. Sm., the only 

 locality for which is on Ben Lawers. Like that species it is asso"^- 

 ciated with Sirosiphon saocicola, which forms dark patches between 

 the thalline squamules. It may be only a variety of that species, but 

 is distinguished from it by the whitish margins of the squamules, and 

 the darker thallus. 



Bilimhia melcBua Arnold. On decaying mosses and hepatics on 

 Snowdon. — B. lignaria Massal. Encrasting decaying mosses hio-h 

 up in Cwm Glas, and over-running Gladonioe and mosses among^st 

 Cerania on Snowdon. 



Bacidia iimhrina Branth & Eostr. Eocks in the wood by Llyn 

 Perris, vars. tiirgida Th. Fr. and compacta Th. Fr. On walls amongst 

 small mosses in Llanberis Pass. 



Buellia myriocarpa Mudd. On a tree-stump near Llanberis. — 

 B. colJudens Tuck. Eocks in Cwm Glas. 



Rhizocmyon geograpliicum DC. Common, with forms coniigua 

 Leight. and urceola Leight.— =^i^. (Ederi Koerb. Boulders in Llan- 

 beris Pass, on Clogwyn, and near the summit of Snowdon. — 

 B. petraum Massal. By the lake in Llanberis Pass. — E. confervoides 

 DC. On stones near Llanberis, and on Snowdon. 



Artlwnia radiata Ach. and var. Stcartziana Sydow. On oaks 

 near Llanberis Castle ; also a brown form on alders near Nant Perris, 

 Mr. G. Travis. 



Graphis scripta Ach. Woods near Llanberis Castle. 



Fli(Eogr aphis inusta Miill.-Arg. *var. macidaris A. L. Sm. With 

 the preceding species. 



Bermatocarpon aquaticum A. Zahlbr. Stream betAveen Crib Goch 

 and Cwm Glas. 



*Verrucaria Icevata Ach. Stones in the stream near Llanberis 

 Castle. 



Arthopyrenia epidermidis Mudd. On birch and oak near Llan- 

 beris and Nant Perris. — A. suhnicans A. L. Sm. On smooth bark 

 near Llanberis Castle ; also found on alders near Nant Perris by 

 Mr. Travis. 



Borina carpinea A. Zahlbr. Trees near Llvn Pada 



rn. 



