Page:Transactions of the Natural History Society of Northumberland, Durham, and Newcastle-upon-Tyne (1867).djvu/312

2. WOODSIA, R. Br.

1. W. ilvensis Woodsia ilvensis, R. Br. Native. Highland type. Area D. Range 1.

In Teesdale on Falcon Clints, 450-500 yards, now nearly or quite extinct.

3. POLYPODIUM, L.

1. P. vulgare Polypodium vulgare, L. Native. British type. Area C, N, D. Range 1, 2.

Rocks, walls, and old trees, common, ascending to 500 yards.

2. P. phegopteris Phegopteris connectilis, L. Native. Scottish type. Area C, N, D. Range 1-3.

Frequent in the hill denes, ascending to 500 yards in Teesdale and the Derwent district, to 700 yards on Cheviot in the Dunsdale ravine, descending nearly to sea-level in Castle Eden Dene.

3. P. dryopteris Gymnocarpium dryopteris, L. Native. Scottish type. Area C, N, D, Range 1, 2.

Often associated with the preceding, and even more frequent, ascending to 500 yards in the Cheviot ravines, 1430 feet near the head of the Knucton Burn, 1400 feet near Allenheads, descending to Castle Eden Dene, Hartlepool Bridge on the Blyth, Walbottle and Scotswood Denes on the Tyne.

4. P. calcareum Gymnocarpium robertianum, Sm. Native. English type. Xerophilous. Area D. Range 2.

Limestone cliffs on the banks of the stream that runs into the Tees at Middleton (T. Wilcke!). Altitude about 400 yards.

4. ALLOSORUS, Bernh.

1. A. crispus Cryptogramma crispa, Bernh. Native. Highland type. Area C, N, D. Range 1-3.

Plentiful in many places on the porphyritic crags of the Cheviot tract, ascending to the head of the ravines, 700 yards, descending to the junction of Caldgate and Common Burns, 200