Archigrammitis

Archigrammitis is a genus of ferns in the family Polypodiaceae, subfamily Grammitidoideae, according to the Pteridophyte Phylogeny Group classification of 2016 (PPG I).[1] It is known from Malesia and Polynesia.

Archigrammitis
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Class: Polypodiopsida
Order: Polypodiales
Suborder: Polypodiineae
Family: Polypodiaceae
Subfamily: Grammitidoideae
Genus: Archigrammitis
Parris[1]
Type species
Archigrammitis friderici-et-pauli
(Christ) Parris[1]
Species

See text.

Description

The rhizomes are dorsiventral (having distinct upper and lower surfaces) with stipes closely spaced attached in two rows. The stipes are jointed and have phyllopodia at the base. The rhizome scales have hairy edges, and are of uniform color and usually glossy.[2]

The leaf blades are undivided, usually bearing branched veins and more than one row of sori on either side of the costa. They always have unbranched hairs, while many species have branched hairs with a single gland at the apex. Some species have hydathodes, some of which are cretaceous (leaving a lime deposit on the leaf around them). The sporangia bear one to two (occasionally as many as six) stiff, simple straight hairs without glands at the tip of the sporangium.[2]

Parris observed that the genus resembles Prosaptia in bearing phyllopodia at the stipe bases, but lacks the clathrate rhizome scales of that genus. The presence of simple, stiff hairs on the sporangium is shared with Oreogrammitis and Radiogrammitis.[2]

Taxonomy

The genus was first described by Barbara Parris in 2013 to receive some of the species of the genus Grammitis, which as then circumscribed was artificial and contained a number of disparate lineages. The name "Archigrammitis" means "chief Grammitis", referring to the size of the fronds, A. friderici-et-pauli being the largest member of Grammitis under the former circumscription.[2]

Species

Parris placed six species in the genus,[2] which were accepted by the Checklist of Ferns and Lycophytes of the World, as of February 2020:[3]

  • Archigrammitis demissa (Parris) Parris
  • Archigrammitis friderici-et-pauli (Chris) Parris
  • Archigrammitis marquesensis (Parris) Parris
  • Archigrammitis ponapensis (Copel.) Parris
  • Archigrammitis samoensis (Baker) Parris
  • Archigrammitis tahitiensis (C.Chr.) Parris

As of 2016, the genus had not yet undergone phylogenetic study.[4]

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References
  1. 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.
  2. Parris, Barbara S. (2013). "Archigrammitis, a new genus of grammitid fern (Polypodiaceae) from Malesia and Polynesia". Fern Gazette. 19 (4): 135–138.
  3. Hassler, Michael & Schmitt, Bernd (January 2020). "Archigrammitis". Checklist of Ferns and Lycophytes of the World. Version 8.20. Retrieved 2020-02-18.
  4. Sundue, Michael A.; Parris, Barbara S.; Ranker, Tom A.; Smith, Alan R.; Fujimoto, Erin L.; Zamora-Crosby, Delia; Morden, Clifford W.; Chiou, Wen-Liang; Chen, Cheng-Wei; Rouhan, Germinal; Hirai, Regina Y.; Prado, Jefferson (2014). "Global phylogeny and biogeography of grammitid ferns (Polypodiaceae)" (PDF). Molecular Genetics and Evolution. 81: 195–206.
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