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


  1. ^ Beentje, H.; Williamson, J. (2010). The Kew Plant Glossary: an Illustrated Dictionary of Plant Terms. Royal Botanic Gardens, Kew: Kew Publishing. 
  2. ^ Hickey, M.; King, C. (2001). The Cambridge Illustrated Glossary of Botanical Terms. Cambridge University Press.