300 The Scottish Naturalist, 



A NEW SCOTTISH LICHEN. 



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



Litho^rapha Andretvii sp. nov. — Thallus albiis vel albidus vel 

 detritus cinerascens (K — C — ), crassiusculus (crassit. circiter 

 .5 mm.) ; apothecia parva, primum albo-velata demum erum- 

 pentia, nigra, conferta, sessilia vel innato-sessilia, rotundata, 

 oblonga simplicia vel rarius divisa (longit. .2-. 5 mm.), 

 epithecio rimiformi demum explanato, margine proprio, 

 prominulo ssepe inflexo ; sporae in thecis oblongo-pyrifor- 

 mibus infra attenuatis, 8nae ssepissime uniseriatae incolores 

 simplices, breviter ellipsoideae vel interdum fere globosae, 

 uni-nucleatae (nucleo amplo et persistente), .0065-.011 x .005 

 -.007 mm. ; paraphyses distinctae filiformes mediocres apici- 

 bus incoloribus et non vel vix clavatis ; epithecium fulves- 

 cens; hypothecium incolor. lodo gel. hym. non tincta nisi 

 lutescens, protoplasma thecarum fulvescens vel leviter fulves- 

 cens. Gonidia flavo-virescentia majuscula (diam. .008-.016 

 mm.) 



Ad saxa granitica prope New Galloway Scotise, a J. M'Andrew 

 lecta. 



The white veil which covers, at first, the apothecia, seems to 

 correspond to what may be termed the epithallus. 



GLEN TILT: ITS FAUNA AND PLOKA. 



By F. BUCHANAN WHITE, M.D., F.L.S. 

 {Contiwied from page 248.) 



THE flora of Glen Tilt is, as may be imagined, tolerably 

 rich. Tlie thick woods and damp rocks that overshadow 

 the lower course of the Tilt have a very luxuriant sylvan vegeta- 

 tion, quite different in its character from that of the upper and 

 woodless part of the Glen. It will, therefore, be well to consider 

 these apart, and to trace the changes in the flora as we ascend 

 from the junction of the Tilt and Garry to the summits of the 

 mountains. . 



