Herbarium sheet, bog pondweed, Potamogeton polygonifolius, found in shallow water or nearly dry ditches at Churchtown Mop, near Southport, Lancashire, 1849

Herbarium sheet, bog pondweed, Potamogeton polygonifolius, found in shallow water or nearly dry ditches at Churchtown Mop, near Southport, Lancashire, 1849
Herbarium sheet, bog pondweed, Potamogeton polygonifolius, found in shallow water or nearly dry ditches at Churchtown Mop, near Southport, Lancashire, 1849