The Scottish Naturalist. 217 



among which we may usually find all stages of development re-- 

 presented. There is also usually a quantity of a white powdery 

 secretion mixed with clear drops of fluid. 



PoPULUS NIGRA, L. — At the manse of Birnie, near Elgin, I 

 picked up under the trees, in September, two examples of the 

 gall of another species of Aphis — viz.. Pemphigus bur sarins.^ L. 

 They occur singly on the petioles of the leaves as green, irregu- 

 larly conical outgrowths {yz-y^. xVs"/^ inch), with naked sur- 

 face, wrinkled longitudinally. The walls are fleshy or leathery, 

 and enclose a single cavity, which opens by an irregular fissure 

 at the apex of the cone. 



On the same leaves were patches oi Erineum populimim^ Pers., 

 galls of Phytoptus already indicated ('Scot. Nat.,' ii. 254 (</)), as 

 found on PoptUus tremula. 



T 



NEW AND EAKE SCOTTISH LICHENS. 



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



HIS year's excursions to our Highland mountains have 

 revealed many interesting lichens, and notably that to 

 Rannoch, in company of the Rev. J. Stevenson, Dr Buchanan 

 White, and Dr Carrington. Besides those of which descriptions 

 are given below, many others were found in Rannoch, as — 



BcEomyces I'oseus (Pers.) 

 Parmelia Mougeotii (Schaer.) 

 Normandina IcEtevirens (Turn.) 

 Lecidea higiibris (Smrf.) 

 Lecidea leiuophaa (Flk.) 

 Lecidea Pilati (Hepp.) 

 Lecidea auriculata (Th. Fr.) = 

 Lecidea sarcogyniza (Nyl.), &c. &c. 

 By the way, I find Z. auriculata very common on all our 

 mountains, ascending however to no great elevation. 



Parmelia PLACORODIA (Ach.), ' Nyl. Scand.,' p. 106; = Cetraria 

 aleurites (Ach.), ' Fr. Scand.,' p. 109 ; near Inveroran : barren. 



Lecanora exomila, sp. n. 



Thallus obscure cinerascens, vel etiam nigrescenSy hinc inde sqiianiidosus rugtc- 

 losus {an propruis?) ; apothccia adpressa, fiisca vel fusco-nigra, plana {latit. 

 •5 — 1 ntj?i.), margine proniimdo crenato vel, in junioribtis, striatim riigosulOy 

 ccerulescente vel pallide ccerulescaite cincta ; spo7'ce Sncs incolores ellipsoidece, sim- 



