NEW BRITISH LICHENS. 35 



parapliyses crassinsculte satis bene distinctfe pellucidje, apicibus 

 fusees centibus clavatis granuloso-inspersis ; hypothecium tenue 

 fusco-nigrum. Gel. hym. iodo intense, coerulescens fere nigra. 



Ad Saxa granitica prope Grantown. 



Thallus brownish black granulose, granules either dispersed or 

 conglomerate ; apothecia closely set, very frequently contiguous, 

 small black sessile ctesio-pruinose with a prominent inllexed 

 margin ; spores 8, simple colourless, almost cylindrical small, per- 

 haps not matured ; paraphyses thickish, not very distinct pellucid 

 with brownish clavate apices ; hypothecium thin nigro-fuscous. 

 Gel. hym. intensely blue, almost black with iodine. 



Lecidea lypexiza. Strn. — Thallus cinerascens vel plumbeo-cine- 

 rascens tenuis la?vis continuuis (K — C — ) obscure limitatus ; apo- 

 thecia adnata nigra plana vel nonnihil convexa, obtuse marginata, 

 mediocria vel majuscula, intus cinerascentia ; sporaj 8na3 fuscse 

 ellipsoidfe l-septataj et stepissime nucleatte, •01G-.022 X •009-*012 

 m.m. ; paraphyses graciles nonnihil irregulares granuloso-insperste, 

 apicibus bis tervis ramosis et interdum articulatis ; hypothecium 

 fuscescens gramosum. Gel. hym. iodo intense ccerulescens fere 

 nigra. 



Ad corticem lajvem prope Killin. 



Thallus cinerascent or bluish-cinerascent, thin, smooth, continu- 

 ous (K — C — ), obscurely limited ; apothecia sessile, black, plane 

 or somewhat convex, rather large, bluntly margined, cinerascent 

 within ; spores 8, fuscous ellipsoid, 1- septate, and very often with 

 3 or 4 nuclei, rather large ; paraphyses distinct, filiform, with 

 numerous granules interspersed, apices twice or even thrice divided 

 and often articulated ; hypothecium fuscescent grumous. Gel. hym. 

 intensely blue, almost black with iodine. 



Xylogxapha scaphoidea. St7-n. — Thallus macula alba vel obso- 

 leta indicatus ; apothecia prominula fusca oblonga, rotuudata vel 

 flexuosa, parva, epithecio rimiformi, margine prominulo crasso ; 

 sporse 8n«, incolores sim})lices ellipsoide*, •012-"016 X '006-"008 

 m.m. ; paraphyses irregularis, indistinctte, apicibus fuscis congluti- 

 natis ; hypothecium incolor. Gel. hym. iodo obsoleto coerulescens 

 dein fulvescens. 



Ad alnnm decorticatam prope Dalwhinnie et Grantown. 



Thallus indicated by a white spot, often almost obsolete ; apo- 

 thecia prominent, fuscous, oblong, roundish or evenflexuose, small, 

 epithecium rimiform, with a prominent round border ; spores 8, 

 colourless, simple, ellipsoid, moderate ; paraphyses not distinct ; 

 hypothecium colourless. Gel. hym. obsoletely coerulescent, then 

 fulvescent with iodine. 



The gonidia interspersed amongst the fibres of the wood are 

 large, green, •012--()18 m.m. in diameter. 



Opegxapha contexta., Strn. — Thallus rufo-cervinus tenuis fusco- 



