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PYRENA
A pyrena (/paɪˈriːnə/) (pl. pyrenae) or pyrene, commonly called a pit or stone, is the fruitstone inside certain types of fruit, namely drupes or drupelets
skin, and mesocarp, or flesh) surrounds a single shell (the pit, stone, or pyrena) of hardened endocarp with a seed (kernel) inside. Drupes do not split open
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
diagram Floral formula Floral symmetry Whorl Fruit Anatomy Berry Capsule Nut Pyrena Seed Dispersal Endosperm Gametophyte Gynandrium Gynoecium Carpel Ovary Locule
of stoneworts). In botany, the term "nutlet" can be used to describe a pyrena or pyrene, which is a seed covered by a stony layer, such as the kernel
thinner-fleshed and smaller fruits than cultivated trees. O. europaea contains a pyrena called in British English a "stone", and in American English a "pit". Unripe
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
earth Other forms Bone bed Kerogen alginite oil shale Phosphate phosphorite Pyrena Related Mineral evolution In soil mineralization immobilization Ballast
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,
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