Pyrena

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This article is about a subject of plant anatomy; 
For  'Pyrene', or other uses of  'Pyrena', see Pyrene (disambiguation); 
For  'Pirene', see Pirene.
Not to be confused with pyrenoid, an organelle within the chloroplast of some algae and hornworts
Pyrenes extracted from a single fruit of Crataegus punctata

Pyrena or pyrene is the name for a nutlet resembling a seed, within a drupe or drupelet.