A sorus (pl.: sori) is a cluster of sporangia (structures producing and containing spores) in ferns and fungi. A coenosorus (pl.: coenosori) is a compound sorus composed of multiple, fused sori.
The underside of a fertile frond of Dicksonia antarctica. Each circular brown structure is an individual sorus.
In lichens and other fungi, the sorus is surrounded by an external layer. In some red algae, it may take the form of depression into the thallus.
In ferns, the sori form a yellowish or brownish mass on the edge or underside of a fertile frond. In some species, they are protected during development by a scale or film of tissue called the indusium, which forms an umbrella-like cover.
Life cycle significanceedit
Sori occur on the sporophyte generation, the sporangia within producing haploid meiospores. As the sporangia mature, the indusium shrivels so that spore release is unimpeded. The sporangia then burst and release the spores.
As an aid to identificationedit
The shape, arrangement, and location of the sori are often valuable clues in the identification of fern taxa. Sori may be circular or linear. They may be arranged in rows, either parallel or oblique to the costa, or randomly. Their location may be marginal or set away from the margin on the frond lamina. The presence or absence of indusium is also used to identify fern taxa.
Encyclopædia Britannica: sorus 2007. Encyclopædia Britannica Online. Retrieved 20 November 2007.
November 24, 2023
sorus, villages, azerbaijan, soru, azerbaijan, sors, azerbaijan, sorus, sori, cluster, sporangia, structures, producing, containing, spores, ferns, fungi, coenosorus, coenosori, compound, sorus, composed, multiple, fused, sori, underside, fertile, frond, dicks. For the villages in Azerbaijan see Soru Azerbaijan and Sors Azerbaijan A sorus pl sori is a cluster of sporangia structures producing and containing spores in ferns and fungi A coenosorus pl coenosori is a compound sorus composed of multiple fused sori The underside of a fertile frond of Dicksonia antarctica Each circular brown structure is an individual sorus Contents 1 Etymology 2 Structure 3 Life cycle significance 4 As an aid to identification 5 Gallery 6 See also 7 References and external linksEtymology editThis Neo Latin word is from Ancient Greek swros sōros stack pile heap Structure editIn lichens and other fungi the sorus is surrounded by an external layer In some red algae it may take the form of depression into the thallus In ferns the sori form a yellowish or brownish mass on the edge or underside of a fertile frond In some species they are protected during development by a scale or film of tissue called the indusium which forms an umbrella like cover Life cycle significance editSori occur on the sporophyte generation the sporangia within producing haploid meiospores As the sporangia mature the indusium shrivels so that spore release is unimpeded The sporangia then burst and release the spores As an aid to identification editThe shape arrangement and location of the sori are often valuable clues in the identification of fern taxa Sori may be circular or linear They may be arranged in rows either parallel or oblique to the costa or randomly Their location may be marginal or set away from the margin on the frond lamina The presence or absence of indusium is also used to identify fern taxa Gallery edit nbsp Wikimedia Commons has media related to Sorus nbsp Sorus of Phlebodium aureum nbsp Scattered sori nbsp Linear sori nbsp Sori covering a frond s entire underside acrostichoid nbsp Fern sorus with immature sporangia nbsp Circular sori with mature sporangia nbsp Sori with indusia at different stages of development nbsp Fungal sori of the Meadowsweet Rust gall nbsp Large sori nbsp Polypodium vulgare nbsp Sword fern The indusia have opened revealing the sporangia Scale bar 1 mmSee also editSorocarpReferences and external links editDiversityOfLife Fern identification tool Encyclopaedia Britannica sorus 2007 Encyclopaedia Britannica Online Retrieved 20 November 2007 Retrieved from https en wikipedia org w index php title Sorus amp oldid 1182345804, wikipedia, wiki, book, books, library,
