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elliptic, slender, seed coat dull, 1.2-3.8 mm long depending on subspecies. Deeply pitted, 20-60 longitudinal pits.
angular 5-10 sided, ~ 0.5 mm long; reticulate pattern of cell wall clearly visible
elliptic-reniform, 1-2 mm long; divided into 4 segments
earlike shape (with covering removed), 2-4 mm long; short beaked; indented along margin and face; coiled embryo
ear shaped to reniform, 1-1.5 mm long, shape similar to Potamogeton; short, thin, straight beak sometimes present
subfossil embryo; ear-shaped; small size suggests that embryo is immature; connections to outer covering visible in image...
broadly elliptic, 1 mm long; longitudinally ridged; both ends (hilum and chalazal) are conspicuos
earlike shape (with covering removed), 2-4 mm long; short beaked; indented along margin and face; coiled embryo
fragile, dark stem; foliar scars alternate, formed from basal remains leaves; leaves acuminate (tapering to a point) tran...
