Diagram of a typical drupe, in this case a peach, illustrating the layers of both the fruit and the seed; the pyrene is the hardened endocarp which encloses the seed
This article is about fruitstones. For the organelle within the chloroplast of some algae and hornworts, see pyrenoid. For other uses of "pyrene", see Pyrene (disambiguation).
Not to be confused with Pirene.
A pyrena or pyrene (commonly called a "pit" or "stone") is the fruitstone within a drupe or drupelet produced by the ossification of the endocarp or lining of the fruit.[1] It consists of a hard endocarp tissue surrounding one or more seeds (also called the "kernel").[2][3] The hardened endocarp which constitutes the pyrene provides a protective physical barrier around the seed, shielding it from pathogens and herbivory.[4]
While many drupes are monopyrenous, containing only one pyrene, pome-type fruit with a hard, stony (rather than leathery) endocarp are typically polypyrenous drupes, containing multiple pyrenes.[5]
A pyrena or pyrene (commonly called a "pit" or "stone") is the fruitstone within a drupe or drupelet produced by the ossification of the endocarp or lining...
the fruit endocarp, which forms a hard shell around the seed called the pyrena (stone or pit). The kernel contains amygdalin, a poisonous compound, in...
or flesh) surrounds a single shell (the pip (UK), pit (US), stone, or pyrena) of hardened endocarp with a seed (kernel) inside. These fruits usually...
Olives are harvested in the green to purple stage. O. europaea contains a pyrena commonly referred to in American English as a "pit", and in British English...
edible while the endocarp itself forms a hard, inedible shell called the pyrena ("stone" or "pit"). This shell encloses the seed (or "kernel"), which is...
a reticulated, hard shell (like the outside of a peach pit) called the pyrena. Inside the shell is the edible seed, commonly called a nut. Generally,...
are also known as amritaphala (fruits of ambrosia).[citation needed] The pyrena of the fruit, commonly called the "pit" or "stone", is typically divided...
earth Other forms Bone bed Kerogen alginite oil shale Phosphate phosphorite Pyrena Related Mineral evolution In soil mineralization immobilization Ballast...
earth Other forms Bone bed Kerogen alginite oil shale Phosphate phosphorite Pyrena Related Mineral evolution In soil mineralization immobilization Ballast...
(2013) (Grimm Fairy Tales presents Oz) Zelena (2014) (Once Upon a Time) Pyrena (2017) (The Wicked Wizard of Oz) West (2017) (Emerald City) Morella (2019)...
earth Other forms Bone bed Kerogen alginite oil shale Phosphate phosphorite Pyrena Related Mineral evolution In soil mineralization immobilization Ballast...
earth Other forms Bone bed Kerogen alginite oil shale Phosphate phosphorite Pyrena Related Mineral evolution In soil mineralization immobilization Ballast...
earth Other forms Bone bed Kerogen alginite oil shale Phosphate phosphorite Pyrena Related Mineral evolution In soil mineralization immobilization Ballast...
device Pulsed inductive thruster, a device used in spacecraft propulsion Pyrena or pit, the hard seed-bearing kernel inside drupe fruits such as peaches...
earth Other forms Bone bed Kerogen alginite oil shale Phosphate phosphorite Pyrena Related Mineral evolution In soil mineralization immobilization Ballast...
earth Other forms Bone bed Kerogen alginite oil shale Phosphate phosphorite Pyrena Related Mineral evolution In soil mineralization immobilization Ballast...
earth Other forms Bone bed Kerogen alginite oil shale Phosphate phosphorite Pyrena Related Mineral evolution In soil mineralization immobilization Ballast...
earth Other forms Bone bed Kerogen alginite oil shale Phosphate phosphorite Pyrena Related Mineral evolution In soil mineralization immobilization Ballast...
earth Other forms Bone bed Kerogen alginite oil shale Phosphate phosphorite Pyrena Related Mineral evolution In soil mineralization immobilization Ballast...
release seeds; (e.g. hazelnuts) Drupes: seed contained within a pit (stone or pyrena) that itself is surrounded by a fleshy fruit (e.g. almonds, walnuts); Gymnosperm...
Global Information