Acorn
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The acorn is the nut of the oaks and their close relatives; alternatively known as glans. It usually contains a seedling surrounded by two cotyledons, enclosed in a tough shell known as the pericarp,
English oak acorn
Acorns of the willow oak in South Carolina (from small to large, counterclockwise from center): Q. phellos (willow oak), Q. falcata (southern red oak; top right), Q. alba (white oak), and Q. coccinea (scarlet oak). Scale bar at upper right is 1 cm.
Diagram of the anatomy of an acorn: A.) Cupule B.) Pericarp (fruit wall) C.) Seed coat (testa) D.) Cotyledons (2) E.) Plumule F.) Radicle G.) Remains of style. Together D., E., and F. make up the embryo.
Horses eating acorns. Acorns can cause painful death in equines, especially if eaten in excess.
Nut (fruit)
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A nut is a fruit consisting of a hard or tough nutshell protecting a single seed. In botany, the use of the term nut implies that the shell does not open to release the seed.
Acorn
…The acorn is the nut of the oaks and their close relatives (genera Quercus, Notholithocarpus and Lithocarpus, in the family Fagaceae); alternatively known as glans. It…
Diagram of a shagbark hickory nut
An Eastern chipmunk (Tamias striatus) with a hazelnut in its mouth
Walnut kernels