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3-5 mm long; short beak (near top of seed); loose, shiny, inflated covering often preserved in lake sediments; in photo c...
leaves in whorls of 6-12; each leaf 8-40 mm long, usually forked in 2-8 segements with spiny teeth along margins; stiff, ...
Elliptic, slender, seed coat shiny, up to 3.2 mm long, 1/3 as thick as long, marked with 30-40 longitudinal rows of obscu...
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...
