Page:Transactions of the Natural History Society of Northumberland, Durham, and Newcastle-upon-Tyne (1867).djvu/265

3. ALNUS, L.

1. A. glutinosa Alnus glutinosa, L. Native. British type. Area C, N, D. Range 1, 2.

Common by stream-sides and in damp woods, ascending to 850 yards in Teesdale and East Allendale, and to 1150 feet in Weardale.

4. BETULA, L.

1. B. alba Betula pubescens, L. Native. British type. Area C, N, D. Range 1, 2.

Common upon heaths and in woods amongst the hills, ascending to 500 yards in Teesdale. B. glutinosa, Fries., is the common moorland form.

2. B. nana Betula nana, L. Incognit.

There is a specimen in Winch's Herbarium at the Linnean Society marked, "In moss-holes on Wooler Common, N. Said to have been found by Mr. Yeach." The station seems altogether unlikely for the true plant, being within the Midagrarian zone.

5. POPULUS, L.

1. P. alba Populus alba, L. Denizen. English type. Area C, N, D. Range 1.

Not 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. canescens Populus canescens, Sm. Denizen. English type. Area C, N, D. Range 1.

In similar places to the preceding, but less frequent. There are several fine trees in a hedge on the south side of the Coquet near Rothbury.

3. P. tremula Populus tremula, L. Native. British type. Area C, N, D. Range 1, 2.

Frequent in woods and hedges, ascending in Teesdale to 1450 feet on Falcon Clints.