 Pilularia globulifera

Pilularia globulifera, or pillwort, is an unusual species of fern native to western Europe, where it grows at edges of lakes, ponds, ditches and marshes, on wet clay or clay-sand soil, sometimes in water up to deep.Pillwort has slender, cylindrical, rush-like fronds up to tall that are shaped like croziers as they unfurl.