Acrostichum

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Leather ferns
Acrostichum aureum-wk-sori.jpg
Scientific classification
Kingdom: Plantae
Division: Pteridophyta
Class: Pteridopsida
Order: Polypodiales
Family: Pteridaceae
Subfamily: Ceratopteridoideae
Genus: Acrostichum
L.
Synonyms

Chrysodium Fée

A. aureum growing in Indonesia

Acrostichum is a fern genus in the Ceratopteridoideae 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 solid 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.

Species[edit]

References[edit]

  1. ^ Christenhusz et al., 2011 Maarten J. M. Christenhusz, Xian-Chun Zhang & Herald Schneider: "A linear sequence of extant families and genera of lycophytes and ferns," Phytotaxa, 19: 7-54 (18 Feb. 2011)