Pyrena
From Infogalactic: the planetary knowledge core
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File:Crataeguspunctata.jpg
Pyrenes extracted from a single fruit of Crataegus punctata
File:Prunus persica pit.jpg
A pyrene dissected to reveal the seed
Pyrena or pyrene is the name for the stone within a drupe or drupelet. It consists of a seed surrounded by hard endocarp tissue.[1][2]
References
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