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- Annulus_(botany) abstract "An annulus in botany is a single row of specialized cells on the outer rim of a fern sporangium that serves in spore dispersal. It consists typically of a ring or belt of dead water-filled cells with differentially thickened cell walls that stretches about two-thirds around each sporangium in leptosporangiate ferns. The thinner walls on the outside allow water to evaporate quickly under dry conditions. This dehiscence causes the cells to shrink and a contraction and straightening of the annulus ring, eventually rupturing the sporangial wall by ripping apart thin-walled lip cells on the opposite side of the sporangium. As more water evaporates, air bubbles form in the cells causing the contracted annulus to snap forward again, thus dislodging and launching the spores away from the plant. The type and position of the annulus is variable (e.g. patch, apical, oblique, or vertical) and can be used to distinguish major groups of leptosporangiate ferns.".
- Annulus_(botany) thumbnail ONF_Fig_02_-_Sporangium_of_Polypodium_vulgare.png?width=300.
- Annulus_(botany) wikiPageExternalLink 1322.abstract.
- Annulus_(botany) wikiPageID "35103406".
- Annulus_(botany) wikiPageLength "1351".
- Annulus_(botany) wikiPageOutDegree "7".
- Annulus_(botany) wikiPageRevisionID "654647735".
- Annulus_(botany) wikiPageWikiLink Category:Plant_anatomy.
- Annulus_(botany) wikiPageWikiLink Dehiscence_(botany).
- Annulus_(botany) wikiPageWikiLink Leptosporangiate_fern.
- Annulus_(botany) wikiPageWikiLink Sporangium.
- Annulus_(botany) wikiPageWikiLink Spore.
- Annulus_(botany) wikiPageWikiLink Spore_dispersal.
- Annulus_(botany) wikiPageWikiLink File:ONF_Fig_02_-_Sporangium_of_Polypodium_vulgare.png.
- Annulus_(botany) wikiPageWikiLinkText "Annulus (botany)".
- Annulus_(botany) wikiPageWikiLinkText "Annulus".
- Annulus_(botany) wikiPageWikiLinkText "annulus".
- Annulus_(botany) wikiPageUsesTemplate Template:Botany-stub.
- Annulus_(botany) subject Category:Plant_anatomy.
- Annulus_(botany) hypernym Row.
- Annulus_(botany) type Place.
- Annulus_(botany) comment "An annulus in botany is a single row of specialized cells on the outer rim of a fern sporangium that serves in spore dispersal. It consists typically of a ring or belt of dead water-filled cells with differentially thickened cell walls that stretches about two-thirds around each sporangium in leptosporangiate ferns. The thinner walls on the outside allow water to evaporate quickly under dry conditions.".
- Annulus_(botany) label "Annulus (botany)".
- Annulus_(botany) sameAs Q4769748.
- Annulus_(botany) sameAs m.0j62fg8.
- Annulus_(botany) sameAs Q4769748.
- Annulus_(botany) wasDerivedFrom Annulus_(botany)?oldid=654647735.
- Annulus_(botany) depiction ONF_Fig_02_-_Sporangium_of_Polypodium_vulgare.png.
- Annulus_(botany) isPrimaryTopicOf Annulus_(botany).