NORTHUMBEKLAND AND DURHAM. 247 



3. ALNUS, L. 



]. A. fflutinosa, L. Illative. British type. Area C, IS", D. 

 Range 1, 2. 



Common by stream-sides and in damp woods, ascending to 350 

 yards in Teesdale and East Allendale, and to 1150 feet in "Wear- 

 dale. 



4. BETULA, L. 



1. £. alba, L. Native. British type. Area C, N, D. 



Eange 1, 2. 



Common upon heaths and in woods amongst the hills, ascend- 

 ing to 500 yards in. Teesdale. £. glutinosa, Fries., is the com- 

 mon moorland form. 



2. B. nana, L. Incog-nit. 



There is a specimen in Winch's Herbarium at the Linnean 

 Society marked, "In moss-holes on Wooler Common, IS". Said 

 to have been found by Mr. Veach." The station seems altogether 

 unlikely for the true plant, being within the Midagrarian zone. 



5. POPULUS, L. 



1. F. alba, L. Denizen. English type. Area C, IST, D. 



Range 1. 



jS^^ot unfrequent by the stream-sides and in damp woods. It 

 is regarded by Winch as indigenous, but we have no confidence 

 in its claim to be so considered. 



2. P. canescetis, Sm. Denizen. English ty^De. Area C, ]^, 



D. Eange 1. 



In similar places to the preceding, but less fi'equent. There 

 are several fine trees in a hedge on the south side of the Coquet 

 near Eothbury. 



3. P. tremula, L. Native. British type. Area C, N, D. 

 Eange 1, 2. 



Frequent in woods and hedges, ascending in. Teesdale to 1450 

 feet on Falcon Clints. 



