Acrosorus

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.

Acrosorus
Several small clumps of pinnate fern leaves mounted on an herbarium sheet
Pressed specimens of Acrosorus streptophyllus
Scientific classification Edit this 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

See text.

Description

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]

Taxonomy

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]

Species

As of February 2020, the Checklist of Ferns and Lycophytes of the World accepted the following species:[1]

  • Acrosorus friderici-et-pauli (Christ) Copel.
  • Acrosorus grammitidiphyllus (Copel.) Parris
  • Acrosorus pectinatus Parris
  • Acrosorus reineckei (Christ) Copel.
  • Acrosorus schlechteri Christ
  • Acrosorus sclerophyllus (Alderw.) Parris
  • Acrosorus streptophyllus (Baker) Copel.
  • Acrosorus subtriangularis (Alderw.) Parris
  • Acrosorus tenuis Parris
  • Acrosorus vallatus Parris

References
  1. Hassler, Michael & Schmitt, Bernd (January 2020), "Acrosorus", Checklist of Ferns and Lycophytes of the World, Version 8.20, archived from the original on 2017-09-02, retrieved 2020-02-18
  2. 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. S2CID 39980610.
  3. Parris, Barbara S (2018). "The Flora Malesiana account of grammitid ferns (Polypdiaceae): a progress report with an illustrated synoptic key to Malesian genera". Sibbaldia (16): 25–27.
  4. Copeland, Edwin (1906). "New Philippine Ferns". Philippine Journal of Science. 1 supp. 2: 158.


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