''Acrosorus'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nom ...

fern A fern (Polypodiopsida or Polypodiophyta ) is a member of a group of vascular plants (plants with xylem and phloem) that reproduce via spores and have neither seeds nor flowers. The polypodiophytes include all living pteridophytes exce ...

s in the family

Polypodiaceae Polypodiaceae is a family of ferns. In the Pteridophyte Phylogeny Group classification of 2016 (PPG I), the family includes around 65 genera and an estimated 1,650 species and is placed in the order Polypodiales, suborder Polypodiineae. A broade ...

, subfamily

Grammitidoideae Grammitidoideae is a subfamily of the fern family Polypodiaceae, whose members are informally known as grammitids. It comprises a clade of about 750 species. They are distributed over higher elevations in both the Old and New World. This group w ...

, according to the

Pteridophyte Phylogeny Group The Pteridophyte Phylogeny Group, or PPG, is an informal international group of systematic botanists who collaborate to establish a consensus on the classification of pteridophytes ( lycophytes and ferns) that reflects knowledge about plant relatio ...

classification of 2016 (PPG I). It is known from the Philippines,

Malesia Malesia is a biogeographical region straddling the Equator and the boundaries of the Indomalayan and Australasian realms, and also a phytogeographical floristic region in the Paleotropical Kingdom. It has been given different definitions. Th ...

, Thailand, and the Pacific islands.

Description

Members of the genus have radially symmetric (rather than flattened) rhizomes, covered with hairless scales of uniform color. Their leaves may be partly cut, into lobes, or fully divided into pinnae. Their veins are at most a few times forked, and lack

hydathode A hydathode is a type of pore, commonly found in angiosperms, that secretes water through pores in the epidermis or leaf margin, typically at the tip of a marginal tooth or serration. Hydathodes occur in the leaves of submerged aquatic plants suc ...

s. Each lobe or pinna of a fertile leaf bears a single

sorus A sorus (pl. sori) is a cluster of sporangia (structures producing and containing spores) in ferns and fungi. A coenosorus (plural coenosori) is a compound sorus composed of multiple, fused sori. Etymology This New Latin word is from Ancient Gr ...

near the tip; the edges of the lobes or pinnae are rolled under and fused near the tip to protect the sorus. Leaf hairs may be single

seta In biology, setae (singular seta ; from the Latin word for " bristle") are any of a number of different bristle- or hair-like structures on living organisms. Animal setae Protostomes Annelid setae are stiff bristles present on the body. ...

e (bristles), single catenate hairs (consisting of chains of cells), or branched catenate hairs, with setae for branches.

Taxonomy

The genus was created by

Edwin Copeland Edwin Bingham Copeland (September 30, 1873 – March 16, 1964) was an American botanist and agriculturist. He is known for founding the University of the Philippines College of Agriculture at Los Baños, Laguna and for being one of the America's ...

in 1906, to accommodate a group of ferns similar to '' Prosaptia'' and until then classified in '' Davallia''.

Species

, the ''Checklist of Ferns and Lycophytes of the World'' accepted the following species: *'' Acrosorus friderici-et-pauli'' (Christ) Copel. *''

Acrosorus grammitidiphyllus ''Acrosorus'' is a genus of ferns in the family Polypodiaceae, subfamily Grammitidoideae, according to the Pteridophyte Phylogeny Group classification of 2016 (PPG I). It is known from the Philippines, Malesia, Thailand, and the Pacific isla ...

'' (Copel.) Parris *'' Acrosorus pectinatus'' Parris *''

Acrosorus reineckei ''Acrosorus'' is a genus of ferns in the family Polypodiaceae, subfamily Grammitidoideae, according to the Pteridophyte Phylogeny Group classification of 2016 (PPG I). It is known from the Philippines, Malesia, Thailand, and the Pacific isla ...

'' (Christ) Copel. *''

Acrosorus schlechteri ''Acrosorus'' is a genus of ferns in the family Polypodiaceae, subfamily Grammitidoideae, according to the Pteridophyte Phylogeny Group classification of 2016 (PPG I). It is known from the Philippines, Malesia, Thailand, and the Pacific isla ...

'' Christ *''

Acrosorus sclerophyllus ''Acrosorus'' is a genus of ferns in the family Polypodiaceae, subfamily Grammitidoideae, according to the Pteridophyte Phylogeny Group classification of 2016 (PPG I). It is known from the Philippines, Malesia, Thailand, and the Pacific isla ...

'' (Alderw.) Parris *''

Acrosorus streptophyllus ''Acrosorus'' is a genus of ferns in the family Polypodiaceae, subfamily Grammitidoideae, according to the Pteridophyte Phylogeny Group classification of 2016 (PPG I). It is known from the Philippines, Malesia, Thailand, and the Pacific isla ...

'' (Baker) Copel. *''

Acrosorus subtriangularis ''Acrosorus'' is a genus of ferns in the family Polypodiaceae, subfamily Grammitidoideae, according to the Pteridophyte Phylogeny Group classification of 2016 (PPG I). It is known from the Philippines, Malesia, Thailand, and the Pacific isla ...

'' (Alderw.) Parris *''

Acrosorus tenuis ''Acrosorus'' is a genus of ferns in the family Polypodiaceae, subfamily Grammitidoideae, according to the Pteridophyte Phylogeny Group classification of 2016 (PPG I). It is known from the Philippines, Malesia, Thailand, and the Pacific isla ...

'' Parris *'' Acrosorus vallatus'' Parris

References

Polypodiaceae Fern genera {{Polypodiaceae-stub