132 
decayed wood of dead fir trees, the very rare Buxbaumia 
indusiata, and he gathers the other species, B. aphylla, at a 
somewhat higher level, on debris. The moors, streams, and 
rocks of Glen Callater and Loch Kandor are notable for their 
rarities, conspicuous among which stand 
Audreoea falcata Hypnum dilatatum 
Grimmia at rata „ arcticum 
Tetraplodon augustatus Mielichoferia nitida 
The latter species is specially interesting from the fact 
of its having been re-discovered, in 1868, by Messrs. Fer- 
gusson and Boy, in the same station when, in 1830, a single 
tuft had been found by Dr. Greville. The only other British 
locality is above Ingleby Greenhow, in Yorkshire, where 
Mr. Mudd (now of the Botanic Gardens, Cambridge) col- 
lected it in 1862. Ba-mac-dhui, the loftiest of the Cairn- 
gorm range, produces several very rare species abundantly, 
viz. : — 
Polytrichum sexangulare Dicranum arcticum Sch. (D. 
Audreoea nivalis Starkii /3 molle Wils) 
,, grimsulana Hypnum molle Dicks. 
The last-named species was, until very recently, almost 
unknown to botanists generally, and is still, as regards its 
synonomy, enveloped in considerable doubt. 
Short as the preceding sketch is, it will suffice to show 
the great difference between the micaceous mountains of 
Perthshire and the slaty and granitic ones of Braemar. 
Either region will richly repay the naturalist who may 
devote his time to its exploration, whilst the scenery around 
him must excite his intensest admiration, and of itself will 
amply repay him for a visit. 
Mr. John Watson exhibited upwards of 200 drawings 
from slides sent by him to Mr. Tuffen West, hereafter to be 
lithographed with others for his intended treatise on the 
