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
Pressed specimens of Acrosorus streptophyllus
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
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, 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.
  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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