GLASGOW SOCIETY OF FIELD NATURALISTS. 85 



Glasgow, Anderson's University, 

 SSthSept, 1875. 



LICHENS, BRITISH AND FOEEIGN. 



By Db. J. STIRTON. 

 »4-< 



Physcia retrogressa, Sp. nov. 

 Sat similis Pli. Stellari sed medulla (K — ) et sporis nonnihil 

 parvioribus, -013 — -018 X "007 — -009 mm. 



Ad cortices prope Altnaharra, in Comitatu Sutherland. 



Physcia tenella, \ax. fimbriatula. 



Similis Ph. tenellse sed laciniis longioribus angustioribus (latit. 

 •2 — 4 mm.) et plerumque eztremitatibus albo-sorediatis, margine 

 fibrilloso-ciliatis, ciliis longis et ssepissime extremitatibus digitato- 

 divisis. 



Ad saxa, Ben Lawers. 



Lecanora atra. 



* sub-byssoidea. 

 Thallus nigro-cinereus vel fere niger granulosus, effiguratus, 

 hypothallo albo sub-byssoideo. 

 Ad saxa prope Blair- Athole. 



Lecanora mammillifera. 



Thallus obsciu-e cinereus vel fusco-cinereus, minute areolato- 

 diffractus, areolis planis (K — C — ); apothecia nigra vel fusco- 

 nigra parva (latit. '2 — -3 mm.), prominula convexa, intus 

 pallide cinerascentia, margine obtuso demum depresso cincta ; 

 sporse 8n8e incolores ellipsoidese simplices, '008 — *01 X '007 

 — -0085 mm. ; paraphyses parcse distinctBe crassiusculse (crass, 

 circa "0025 mm.), apicibus crasse clavatis conglutinatis fuscis, 

 hypothecium incolor. lodo gel. hym. ccerulescens dein fulvescens, 

 prsesertim ea thecarum. 



Ad saxa, socia L. Kochianse, apud Ben-y-gloe, 



Leciuea aniptiza. 

 Thallus nigro-cinereus vel nigro-virescens granulosus tenuis ; 

 apothecia nigra parva prominula convexa immarginata, papillosa 

 (quasi glomerata) intus tota cinerascentia ; sporse Snse incolores 



