dcsimg

Description

provided by Flora of Zimbabwe
Medium-sized to large, terrestrial, perennial, often deciduous plants. Rhizome erect to procumbent, massive, with large, stiff scales at the apex and thick flashy roots. Fronds weakly dimorphic, tufted, coriaceous, stipes with numerous vascular bundles. Lamina pinnate with a free conform terminal pinna, glabrous when mature. Pinnae large, petiolate; lower ones sterile, upper ones usually fertile, fertile pinnae of the same shape as the sterile ones but usually narrower; veins forming a network without included veinlets. Sori covering the entire undersurface of the fertile pinnae (sporangia acrostichoid), exindusiate.
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Mark Hyde, Bart Wursten and Petra Ballings
bibliographic citation
Hyde, M.A., Wursten, B.T. and Ballings, P. (2002-2014). Acrostichum Flora of Zimbabwe website. Accessed 28 August 2014 at http://www.zimbabweflora.co.zw/speciesdata/genus.php?genus_id=33
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Mark Hyde
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Bart Wursten
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Petra Ballings
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Flora of Zimbabwe

Acrostichum

provided by wikipedia EN

"
A. aureum growing in Indonesia

Acrostichum is a fern genus in the Parkerioideae subfamily of the Pteridaceae.[1] It was one of the original pteridophyte genera delineated by Linnaeus. It was originally drawn very broadly, including all ferns that had sori apparently "acrostichoid", or distributed in a uniform mass across the back of the frond, rather than organized in discrete sori.[2] This led Linnaeus to include such species as Asplenium platyneuron in the genus, because the specimen he received had sori so crowded that it appeared acrostichoid.

Since Acrostichum aureum is regarded as the type for the genus, it is now narrowly circumscribed only to the natural genus of three species, that are allied to the genus Ceratopteris. They are collectively known as the leather ferns or leather swamp ferns, genus members commonly being found in swamps. The species of Acrostichum are massive ferns, with fronds up to 12 feet (3.5 meters) tall, that depend on a semi-aquatic existence. They do not withstand prolonged immersion, but require wet roots. The species Acrostichum aureum is known to have a high saltwater tolerance, growing in mangroves.

Species

References

  1. ^ PPG I (2016), "A community-derived classification for extant lycophytes and ferns", Journal of Systematics and Evolution, 54 (6): 563–603, doi:10.1111/jse.12229
  2. ^ Coulter, John (1917). The Botanical Gazette (volume LXIV). University of Chicago Press. p. 347. Retrieved 26 June 2016.
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Acrostichum: Brief Summary

provided by wikipedia EN
" A. aureum growing in Indonesia

Acrostichum is a fern genus in the Parkerioideae subfamily of the Pteridaceae. It was one of the original pteridophyte genera delineated by Linnaeus. It was originally drawn very broadly, including all ferns that had sori apparently "acrostichoid", or distributed in a uniform mass across the back of the frond, rather than organized in discrete sori. This led Linnaeus to include such species as Asplenium platyneuron in the genus, because the specimen he received had sori so crowded that it appeared acrostichoid.

Since Acrostichum aureum is regarded as the type for the genus, it is now narrowly circumscribed only to the natural genus of three species, that are allied to the genus Ceratopteris. They are collectively known as the leather ferns or leather swamp ferns, genus members commonly being found in swamps. The species of Acrostichum are massive ferns, with fronds up to 12 feet (3.5 meters) tall, that depend on a semi-aquatic existence. They do not withstand prolonged immersion, but require wet roots. The species Acrostichum aureum is known to have a high saltwater tolerance, growing in mangroves.

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