The Scottish Naturalist 



27 



say which species it is. I should have expected to find specimens of 

 P. endochlora at Inveraray ; since it occurs in Glencroe, which opens 

 from the head of Loch Fyne, and is distant in a straight line not 

 more than a dozen miles ; but 1 have never found this remarkable 

 species except in the glen, where I first discovered it about eight 

 or nine years ago; and in no other habitat in Scotland 

 has it since been gathered. Indeed Mr. Leighton, previous 

 to my discovery, founded the species on a solitary specimen 

 found in Dr. Taylor's collection of Irish lichens, which came from 

 the Lakes of Killarney. I may mention that besides the spots in 

 Glencroe and on the hillsides above Ardgarten, I have found a few 

 stray specimens on the wall behind Valley Cottage, between 

 Arrochar and Tarbet. 



Another Parmeiia of a western or Atlantic type is P. sinuosa, 

 which is a rather rare species. In Glencroe it is met with 

 principally on boulders on the hillsides ; but at Inveraray it is 

 entirely confined to trees, occurring chiefly upon the stems of 

 birches in the upper part of the High Preserves. It has a curious 

 habit of growing only in fragments and half-circles ; a completely 

 rounded thallus being rare. It is distinguished by its pale 

 yellowish-green colour, shading into black, its narrow segments, 

 and its black fibrillose under-surface. I have never seen it in 

 fructification. I have already referred to P. pertusa as the 

 characteristic lichen of New Zealand. It is rare in Scotland ; but 

 in the High Preserves at Inveraray, and in the birch woods at 

 Essachossan it is found on almost every tree, and displays its neat 

 round thallus, of a lovely pale green colour, with its closely 

 appressed segments sometimes sorediate, and always marked with 

 minute dark perforations, in the greatest profusion. It is one of 

 the most valued prizes of the lichenologist. I have never seen it 

 in this country in fructification ; but I have gathered it in great 

 abundance in the woods around Interlaken in Switzerland, and in 

 the Naerodal, at the head of the Sogne Fiord, in Norway, on 

 boulders. 



P. perlata is not so common about Inveraray as it is in many 

 other sea-coast places. I have found a few specimens on trees 

 and walls in the neighbourhood of Essachossan. The remarkable 

 Pannaria plumbea, with its corky texture and leaden-coloured 

 downy lower-surface, is accounted rather rare ; but at Inveraray it 

 covers almost every oak, ash, and poplar tree ; and attains to very 



