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| − | '''dehiscence''' (''pl.'' dehiscences; ''synonym:'' ''sl.'' [[ascus dehiscence]], ''pl.'' [[ascus dehiscence]]s) – the process of opening and releasing ascospores from a mature ascus by rupture of the ascus wall, typically, but not always occurring at the ascus apex, sometimes explosive and/or actively ejecting spores, sometimes by gradual disintegration of the wall and subsequent release of spores; different modes of dehiscence have been distinguished: (1) ''evanescence'' ([[prototunicate]]: disintegration of the entire ascus wall; [[verrucaroid]]: disintegration of the apical ascus wall); (2) ''lateral rupture'', i. e., tip sliding off like a hood, e. g., in Corneliales, or in ''Arthrorhaphis''); (3) ''subapical rupture'', i. e., opening with a lid ([[operculate]], [[suboperculate]], and [[pseudopoerculate]]); (4) ''apical rupture'': (4a) ''formation'' ''of a simple pore with no elongation'' ([[inoperculate]]: [[annular]], [[ostropalean]] or [[hypodermataceous]]); (4b) ''formation'' ''of a complex pore with predehiscent elongation'' ([[extenditunicate]]: [[bivalve]] or [[fissurate dehiscence]]); (4c) ''apical rupture with extrusion'': [[semi-fissitunicate]] ([[rostrate dehiscence|rostrate]] and [[eversion-type dehiscence|eversion-type]]; present in most [[lecanoralean]] asci) or [[fissitunicate]] ([[bitunicate]] , "[[jack in the box]]"); ''cf.'' [[dehiscent]], [[non-dehiscent]]. | + | '''dehiscence''' ([[Category:Noun]][[:Category:Noun|noun]], ''pl.'' dehiscences) – in the context of [[ascomycete]]s a synonym for [[ascus dehiscence]]. ''Related terms:'' [[dehiscent]], [[non-dehiscent]]. |
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Latest revision as of 02:00, 7 December 2005
dehiscence (noun, pl. dehiscences) – in the context of ascomycetes a synonym for ascus dehiscence. Related terms: dehiscent, non-dehiscent.
