Macroscopical spherical with a flattened and depressed apicalregion and slightly conical at the base ;
Dull yellowish grey and about 4 to 5 mm in diameter :surface marked by 10 to 16 ridge running from the base to the depression at the apex ,the ridges including the vascular bundies which occur in the middle layer of the pericarp ;testa,exposed by scraping the residue of pericarp . appearing as a dark patch about 1.5 mm in diameter at the base; kernel consisting almost entirely of perisperm , minute embryo lying embedded in a small endosperm in a depression at the apex of the perisperm .
Microscopical the diagnostic characters are lignified beaker cells of endoscarp ;brown pigment layer of testa ; abundant starch in compact polyhedral masses ,individual grians being up to 7 µm in diameter ; large oil cells, 50 to 60 µm in a diameter ; epidermal cells andhypodermal sclerenchyma of the outer part of the pericarp absent.