36 LINDSAY, ON ABROTHALLUS. 



15. Road between Dumfries and Caerlaverock ; with pyc- 

 nides. New red sandstone."^ 



B. On boulders, or rocks in situ, on Highland and Lowland 

 hills : on the former, it is usually found at low elevations, 

 that is, towards the base of the higher Highland mountains ; 

 on the latter, it occurs at all elevations. 



1. Moors to the west of Braemar; with pycnides. Gneiss. 



2. Craig-choinich, Braemar. Granite. 



3. Mor-chone, Braemar. Granite. 



4. Loch-na-gar, Braemar; with pycnides. Granite. 



5. Glen Dee, Braemar. Granite. 



6. Ben Nevis. Mica slate, gneiss, granite. 



7. Moncrieffe Hill, Perth. Basalt, greenstone, amygda- 



loid, and other trap rocks. 



C. On trees : the ash. 



1 . Road between Dumfries and Caerlaverock; with pycnides. 



D. Special habitats unknown. 



1. Wrekin Hill, Shropshire. (Leighton's ' Lich. Brit. 



exsicc.,' No. 46, fasc. 2.) 



2. Barmouth, North Wales. (Rev. W. A. Leighton.) 



II. — On Sticta fuliginosa. 



1. Rocks, New Cut, Meadfort, Torquay, Devonshire. 

 (Leight. ' Lich. Brit, exsicc.,' No. 191, fasc. 6, var. /3. 

 [sub nom. A. Welwitzschii, Mont.]) 



In addition to the habitats which I have given above, 

 Tulasne mentions the occurrence of A. Smithii on Parmelia 

 olivacea, P. tiliacea, and P. omphalodes, in France. I have 

 never met with it on any of these species. I should doubt 

 its occurrence on P. omphalodes ; and suspect that a dark- 

 colom-ed form of P. saxatilis has been mistaken therefor. 

 Korbcr also gives P. olivacea, P. tiliacea, and Cetraria glauca 

 as habitats for it in Germany. On the latter I have seen 

 A. oxysporus, but not A. Smithii. Var. (i, Tulasne' s A. Wel- 

 witzschii, is stated by him to occui' on Sticta sylvatica, on the 

 Scrra de Cintra Mountains, Portugal. 



* The geologic age of tliis saiirlsloue is disputed, some aiithoritics regard- 

 ing it, as properly the old red, and anterior in date to the coal series. — 

 Vi(k Nicol's ' Geology of Scotland,' p. IH. 



