33 



NEW BRITISH LICHENS. 



By Dr. J. Stirton. 



Lecidea emphysa. iS'frw.— Thallus albiis vel albidiis tenuis con- 

 tinuus ; apothecia parva adnata sanguineo-atra, convexa immargi- 

 nata, intus omnino auvantiacea ; spora3 Snse incolores obovata^ 

 l-septat£e, •01-"014: X •00-4-"0045 m.m.; paraphyses valde indis- 

 tinctfe et irregulares ; hypothecium durantiacum. Gelatina 

 hymenialis iodo vinose riibens. 



Supra ligna putrida prope Dalwbinnie. 



Thallus white, thin ; apothecia small, convex, sanguineous- 

 black, orange within ; spores <> colourless, obovate, 1-septate 

 small ; paraphyses very indistinct ; hypothecium orange. Gel. 

 hym., wiiie-red with iodine. 



Ziecidea subvernalis. Strn. — Thallus albus tanquam hypo- 

 phlcBodes tenuissimus ; apothecia parva flavida dein livida demum 

 fnsco-nigra, convexa ininiarginata, intus .pelhicida vel ca;rnlee 

 pellucida ; sporte 8n^ incolores simplices oblouga?, •012-"02 X 

 •0055-"O06 m.m. ; paraphyses hand distinctfe conglutinatje ; 

 hypothecium incolor. Gelatina hymenialis iodo coerulescens dein 

 violacea vel vinose violacea. 



Ad lignum vetustum vel putridum prope Grantown. 



Thallus white, thin, gonidia entangled amongst the woody 

 fibres ; apothecia pale yellow, then bluish black, ultimately fusco- 

 nigricant, small and convex, pellucid within ; spores 8, colourless, 

 simple, oblong, moderate ; paraphyses conglutinate ; hypothecium 

 colourless. Gel. hym., coerulescent, then violaceous or vinoso- 

 violaceous with iodine. 



The habitat as well as other differences appear to warrant a 

 separation of this lichen from L vernalis (Ach.), although, it must 

 be confessed, the variable condition of the latter may extend to 

 this and even include it. 



Iiecidea spoxadiza. Slrn. — Thallns flavidus granulosus vel 

 granuloso-verrucosus, granulis nonnihil pulverulentis (K fiavens 

 dein, C addito, aurantiaco-rubens) ; apothecia nigra, sessilia 

 parva, vel mediocria plana ruaosa, marginata, intus cinerascentia ; 

 sporse 8n£e, incolores, simplices, ellipsoide^e, 'OOG-'OO? X "004- 

 •0045 m.m, ; paraphyses irregulares parcje, indistinctje ; hypo- 

 thecium incolor. Gel. hym., iodo non tincta. 



Ad lignum vetustum ca?sum prope Grantown. 



Thallus yellow or greenish yellow, granulose, granules often 

 conglomerate and pulverulent (K yellow, C orange red) ; apothecia 

 black sessile, small or moderate, plane rugose, margined, cinerascent 

 within ; spores 8, colourless, simple, elliptical, small ; paraphyses, 

 indistinct, not numerous; hypothecium colourless. Gel. hym., not 

 tinted by iodine. 



Allied to L. neglecta (Nyl.). 



VOL. III. 3 



