OF PERTHSHIRE AND ERAEMAR. 319 



Sphagnum curvifolium. Tetraplodon angustatus. 



Audresea falcata. Splacbnum vasculosum. 



Grimmia atrata. Mielichhoferia nitida. 



Dicranum Starkii. Hypnum dilatatum. 



falcatum. arcticum. 



Webera Ludwigii. 



Of these ^ Mielichhoferia nitida has a special interest at- 

 tached to it from the fact of its having been rediscovered 

 in 1868 by Messrs. Ferguson and Roy, in the same station 

 where, in 1830, a single tnft had been found by Dr. Greville. 

 The only other British locality known is above Ingleby, 

 Greenhow, in Yorkshire, where Mr. Mudd, now of the 

 Botanic Gardens, Cambridge, collected it in 1862. 



On the granite of Ben-mac-dhui (and doubtless on other 

 mountains also of the Cairngorm range) a few species are 

 developed, which are well worthy of notice, on account 

 both of their rarity and their extraordinary luxuriance. 

 They are all clustered together in great profusion, in and 

 round the streamlets proceeding from the snow-beds which 

 perpetually exist a few hundred feet below the summit of 

 the mountain, and they grow in a soil consisting of the 

 pure debris of granite. These are : — 



Andreaea nivalis. Hypnum molle, Dicks. 



Dicranum arcticum, Sch. Polytrichum sexangulare (on 



(D. Starkii /3. molle, Wils.). dry ground). 



Webera Ludwigii. Arctoa fulvella (on rocks). 



Andrecea grimsulana has also been gathered, and doubtless 

 is to be found not far removed from the species above in- 

 dicated ; but I was unfortunate enough to overlook it. 



Hypnum molle , Dicks, {fide Wilson), is one of the least 

 understood of British mosses, and owes its disentanglement 

 and identification as a separate species to Mr. Wilson. 

 The plant usually distributed under this name, both in 

 Britain and on the Continent, is Hypnum dilatatum , Wils. 

 MSS. 



The following are the characters of the two species : — 

 H. dilatatum, Wils. [H. molle, Bry. Eur.) . Plant of a 



