Page:Transactions of the Natural History Society of Northumberland, Durham, and Newcastle-upon-Tyne (1867).djvu/282

2. T. palustre Triglochin palustre, L. Native. British type. Area C, N, D. Range 1-3.

Frequent in damp grassy places, ascending to 500 yards in Teesdale, 600 yards in West Allendale, 650 yards in Harwood Dale.

Order 10. FLUVIALES.

1. POTAMOGETON, L.

1. P. densus Potamogeton densus, L. Native. English type. Area N, D. Range 1.

Pond at Walker (F.) and near Howdon Pans (Jno. Storey!). Ponds at Hebburn and in a spring at Manhaven near Marsden (F. R.). In the Wear below Whitworth (Miss Wharton). In the Skerne at Darlington (F.).

2. P. pectinatus Potamogeton pectinatus, L. Native. British type. Area C, N, D. Range 1.

In the Tweed and Wear, the Serpentine at Hardwick, Holy Island Lough, Meggy's Burn near Blyth, and salt water ditches at Hylton and the Tees mouth, and ascending to Crag Lough, 200 yards.

3. P. pusillus Potamogeton pusillus, L. Native. British type. Area C, N, D. Range 1.

Frequent in ditches and slow streams, ascending to Kemmer Lough near Eglingham, 200 yards (T.). A very slender-leaved variety gathered by Professor Oliver near Dunstanbro'.

4. P. gramineus Potamogeton gramineus, L. (P. compressum, Flora.) Native. English type. Area C, N, D. Range 1.

Learmouth Bog near Cornhill (R. Embleton). Crag Lake,

200 yards, Prestwick Carr, and ponds at Widehaugh near Dilston (F. R!). Salt water ditches at Seaton Carew, and in a pond near Darlington (W. Backhouse. F !).