PHYTOLOGY, 



DESOEIPTIONS OP NEW LICHENS- 



By JAMES STIRTON. M.D., F.L.S., 



Pannaria IcLsidla n.s. — Thallus obscure vel nigricanti-virescens, 

 microlepideo-squamulosus vel minute corallideo-granulosus, 

 crassiusculus, hypothallus*^niger crassus (crassit. 1-2 mm.) 

 spongioso-contextus radiculosus (radiculis, latit .004-. 005 5 

 mm.) ; apothecia nigra lecideina (interdum obscure rufa), 

 rotunda vel flexuosa, innato-sessilia plana, acute marginata 

 (latit. .5-1.7 mm,); sporae incolores simplices, ellipsoide^e 

 vel fusiformi-ellipsoidese, episporio nonnihil crenulato, 

 .014-.018 X .00 7-. 009 mm. ; paraphyses distinctje, articulator, 

 crassae (latit. .0025-.0035 mm.), apicibus nigris congluti- 

 natis ; hypothecium fuscescens vel (in lamina crassiuscula) 

 fuscum vel fusco-nigrum. lodo gel. hym. ccerulescens 

 dein vinose rubens vel vinose fulvescens. 



Supra Hcpaticas {Frullanias) prope Garve. 



This lichen plays between P. triptophylla and P. nigra ^ and 

 approaches the former perhaps too much. 



Lecidea cuitiloga n.s. — Thallus vix ullus visibilis; apothecia intus 

 ob. praesertim supra, adnata nigra minuta (lat..i-.25 mm.) 

 plana marginata, margine nitidiusculo ; sporar Snee incolores 

 simplices sphcericae (latit. .004-.0055 mm.); paraphyses 

 valde indistinctce ; hypothecium incolor. lodo gel. hym. 

 ccerulescens dein obscurata vel obscure violacea. 



Ad lignum decorticatum prope Aviemore. 



There are scarcely any paraphyses properly so called, and 

 even liq. potass?e does not render them in any way distinct. 

 The hymenium becomes darker upwards and the epithecium is 

 nigricant or virescenti-nigricant. This lichen can scarcely be 

 an ArUionia. 



