Ben Hall / 2020VISION / Cranesbill geranium (Geranium sp) flower, Montiagh's Moss, County Antrim, Northern Ireland, UK, June. Did you know? Geraniums are known as Cranesbills due to the shape of the fruit capsule.

Chris Mattison / Cheiridopsis robustus, closed seed capsule. Namaqualand, South Africa.

Chris Mattison / Cheiridopsis species, seed capsule open in response to rain. Namaqualand, South Africa.

Chris Mattison / Cheiridopsis species, seed capsule open in response to rain. Namaqualand, South Africa.

Heidi & Hans-Juergen Koch / Greater Spotted Dogfish (Scyliorhinus stellaris) embryo in mermaid's purse egg capsule, native to Atlantic and Mediterranean

Jan Hamrsky / Flatworm egg capsule on stalk (Dugesia gonocephala), Europe, July. Controlled conditions.

Colin Varndell / Sweet chestnut tree (Castanea sativa) capsule and nut. Dorset, UK September.

Chris Mattison / Living stone plant (Lithops pseudotruncatella) with new leaves bursting through the dried up leaves of last year, and ripe seed capsule. Cultivated species, occurs in South Africa.

Chris Mattison / Moss (Bryum capillare) spore capsule, Sheffield, March.

MYN / Dimitris Poursanidis / The mermaid's purse, an egg capsule of a shark, beached material, Heraklion, Crete, Greece meetyourneighbours.net project

Stephen Dalton / Star moss (Polytrichum sp) shedding spores from its capsule. England, UK

Robert Thompson / Mermaid's purse, Egg capsule of the Dogfish shark {Scyliorhinus canicula} Portaferry, Strangford, County Down, Northern Ireland, April