Taken 31-Mar-13
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Keywords:New Zealand, Otago, cardrona, valley, acorn, cupule, oak, tree, leaf, nut, stem
Photo Info

Dimensions3264 x 4896
Original file size8.23 MB
Image typeJPEG
Color spaceAdobe RGB (1998)
Date taken31-Mar-13 11:20
Date modified1-Apr-13 09:48
Shooting Conditions

Camera makeCanon
Camera modelCanon EOS-1D Mark IV
Focal length70 mm
Max lens aperturef/2.8
Exposure1/200 at f/4
FlashNot fired, compulsory mode
Exposure bias0 EV
Exposure modeManual
Exposure prog.Manual
ISO speedISO 100
Metering modePattern
Acorn on stem 1

Acorn on stem 1

The acorn is the nut of the diverse oak tree family usually containing a single seed enclosed in a tough, leathery shell and borne in a cup-shaped cupule. They may take from 6 to 24 months to mature

Acorns are too heavy for wind dispersal so depend on biological seed dispersal agents such as various rodents and birds to collect, consume and disperse the seed. Acorns are attractive to animals because of their comparitive large size and high nutritional value; however the leaves and acorns of the oak tree are poisonous to cattle, horses, sheep, and goats in large amounts due to the toxin tannic acid.