Acrosorus | |
---|---|
Pressed specimens of Acrosorus streptophyllus | |
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Division: | Polypodiophyta |
Class: | Polypodiopsida |
Order: | Polypodiales |
Suborder: | Polypodiineae |
Family: | Polypodiaceae |
Subfamily: | Grammitidoideae |
Genus: |
Acrosorus Copel. [1] |
Type species | |
Acrosorus exaltatus (Copel.) Copel.
[2]
| |
Species | |
Acrosorus is a genus of ferns in the family Polypodiaceae, subfamily Grammitidoideae, according to the Pteridophyte Phylogeny Group classification of 2016 (PPG I). [2] It is known from the Philippines, Malesia, Thailand, and the Pacific islands.
Members of the genus have radially symmetric (rather than flattened) rhizomes, covered with hairless scales of uniform color. [3]
Their leaves may be partly cut, into lobes, or fully divided into pinnae. Their veins are at most a few times forked, and lack hydathodes. [3] Each lobe or pinna of a fertile leaf bears a single sorus near the tip; [4] the edges of the lobes or pinnae are rolled under and fused near the tip to protect the sorus. [3] [4] Leaf hairs may be single setae (bristles), single catenate hairs (consisting of chains of cells), or branched catenate hairs, with setae for branches. [3]
The genus was created by Edwin Copeland in 1906, to accommodate a group of ferns similar to Prosaptia and until then classified in Davallia. [4]
As of May 2024 [update], the Checklist of Ferns and Lycophytes of the World accepted the following species: [1]
Acrosorus | |
---|---|
Pressed specimens of Acrosorus streptophyllus | |
Scientific classification | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Division: | Polypodiophyta |
Class: | Polypodiopsida |
Order: | Polypodiales |
Suborder: | Polypodiineae |
Family: | Polypodiaceae |
Subfamily: | Grammitidoideae |
Genus: |
Acrosorus Copel. [1] |
Type species | |
Acrosorus exaltatus (Copel.) Copel.
[2]
| |
Species | |
Acrosorus is a genus of ferns in the family Polypodiaceae, subfamily Grammitidoideae, according to the Pteridophyte Phylogeny Group classification of 2016 (PPG I). [2] It is known from the Philippines, Malesia, Thailand, and the Pacific islands.
Members of the genus have radially symmetric (rather than flattened) rhizomes, covered with hairless scales of uniform color. [3]
Their leaves may be partly cut, into lobes, or fully divided into pinnae. Their veins are at most a few times forked, and lack hydathodes. [3] Each lobe or pinna of a fertile leaf bears a single sorus near the tip; [4] the edges of the lobes or pinnae are rolled under and fused near the tip to protect the sorus. [3] [4] Leaf hairs may be single setae (bristles), single catenate hairs (consisting of chains of cells), or branched catenate hairs, with setae for branches. [3]
The genus was created by Edwin Copeland in 1906, to accommodate a group of ferns similar to Prosaptia and until then classified in Davallia. [4]
As of May 2024 [update], the Checklist of Ferns and Lycophytes of the World accepted the following species: [1]