1 66 The Scottish Naturalist. 



Saxicola prope Garve. Affinis L. aherranti (Krph.). 



Lecidea sporeta n.s. — Thallus albidus, disperso-squamulosus, 

 squamulis parvis adpressis planis vel convexulis et in- 

 terdum crenulatis (K — C — ) ; apothecia confertissima, 

 fusca vel fusco-nigra, adnata, plana, obtuse marginata 

 nitidiuscula parva (latit. .2-.4 mm.); sporse Snae incolores 

 ellipsoideae simplices, .0117.015 x .005-.006 mm.; para- 

 l^hyses non bene discret?e, fere conglutinatae apicibus 

 fuscescentibus; hypothecium incolor. lodo gel. hym. 

 coerulescens dein fulvescens. 



Saxicola in insula Mull. 



Lecidea pissodes n.s. — Thallus fusco-badius vel fusco-niger, 

 squamuloso-diffractus, squamulis parvis concaviusculis vel 

 planis (K — C — ) ; apothecia conferta nigra, innata parva 

 (latit. 1.5-2.5 mm.), plana tenuiter marginata; sporae Snas 

 incolores oblongse simplices, .007-.01 x .0035-. 0045 mm. ; 

 paraphyses non distinctae irregulares graciles, apicibus 

 nigris vel sordide cceruleo-nigris, conglutinatis ; hypothe- 

 cium incolor. lodo gel. hym. coerulescens dein fulvescens. 



Saxicola in insula Mull. 



The thallus viewed by the naked eye has a pitch-black 

 appearance owing to the prevalence of the apothecia. 



Lecidea orphnceilla n.s. — Thallus niger opacus, minute 

 granuloso-furfuraceus, continuus, bene evolutus ; apothe- 

 cia intus pellucida, nigra sessilia, plana vel convexiuscula, 

 opaca marginata, margine nitidiusculo ssepe flexuoso vel 

 lobato-irregulari vel etiam lobato-inciso; sporae Snae 

 incolores oblongse vel fusiformi-oblong^e, simplices, .013- 

 .018 X .003-. 004 mm., paraphyses crassiuscula3 non bene 

 distinctae fere conglutinatce, apicibus nigris vel cceruleo- 

 nigris crasse clavatis conglutinatis; hypothecium incolor. 

 lodo gel. hym. intense coerulescens fere nigra. 



Saxicola, Mull. 



The epithecium is thick, black, and rendered sordidly 



violascent by nitric acid, while K. has no visible reaction on it 



or on the thalamium throughout. 



Lecidea Mullensis n.s. — Thallus cinereus vel nigro-cinereus, 

 areolato-verrucosus, diffractus (K supra flavens, intus fl. 

 dein ferrugineo-rufus), quasi a columellis (alt. .6-1.3 mm.), 

 erectis, connatis vel passim segregatis et dispersis com- 



