Ptisana

Ptisana is a genus in the eusporangiate fern family Marattiaceae, comprising species historically treated in the genus Marattia. The establishment of this genus follows the 2008 work by Andrew G. Murdock, which supported recognition of this group on the basis of genetic analysis and morphology.[1][2] Ptisana can be distinguished from Marattia by the presence of distinct sutures at the point of leaflet attachment, deeply cut synangia, and the absence of labiate sporangial apertures. The name Ptisana is derived from the Latin word for pearl barley, an allusion to the shape of the synangia.[1]

Ptisana
King fern, Ptisana salicina
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Division: Polypodiophyta
Class: Polypodiopsida
Order: Marattiales
Family: Marattiaceae
Genus: Ptisana
Murdock
Type species
Ptisana salicina
(Sm. 1812) Murdock 2008
Species

See text.

Synonyms
  • Myriotheca Commerson ex de Jussieu 1789 non Zeiller 1883
Sori of Ptisana fraxinea

Ptisana has a palaeotropical distribution, with the westernmost extreme of the range in Ascension Island and extending eastward through tropical Africa, Asia, and Oceania. Ferns in this genus are generally quite large, with fronds often reaching 2–3 meters in length; the one known exception to this is Ptisana rolandi-principis, a critically endangered dwarf species endemic to the Plateau de Dogny in New Caledonia.[3] The basal chromosome number for Ptisana is 2n=78, whereas the one count for Marattia in the strict sense is 2n=80.[4] The type species for the genus is Ptisana salicina, the type specimen of which was collected on Norfolk Island.[1]

Species

Phylogeny of Ptisana[5][6]

P. fraxinea

P. purpurascens

P. oreades

P. salicifolia

P. salicina

P. smithii

P. rolandi-principis

P. attenuata

P. squamosa

P. boninensis

P. novoguineensis

P. papuana

P. melanesica

P. sambucina

P. mertensiana

P. howeana

P. pellucida

P. sylvatica

P. ambulans

P. decipiens

References
  1. Murdock, Andrew G. (2008). "A taxonomic revision of the eusporangiate fern family Marattiaceae, with description of a new genus Ptisana". Taxon. 57 (3): 737–755. doi:10.1002/tax.573007.
  2. Murdock, Andrew G. (2008). "Phylogeny of marattioid ferns (Marattiaceae) inferring a root in the absence of a closely related outgroup". American Journal of Botany. 95 (5): 626–641. doi:10.3732/ajb.2007308. PMID 21632388.
  3. Shepherd, Lara D.; Murdock, Andrew G.; Amice, Rémy; Perrie, Leon R. (2023-02-20). "A synopsis of Ptisana Murdock ferns (Marattiaceae) in New Caledonia based on sequence data and morphology with the recognition of a new vulnerable species, P. soluta (Compton) Murdock & Perrie, comb. nov., stat. nov". Adansonia. 45 (3). doi:10.5252/adansonia2023v45a3. ISSN 1280-8571. S2CID 257914121.
  4. Smith, Alan R; Mickel, John T (1977). "Chromosome counts for Mexican ferns". Brittonia. 29 (4): 391–398. doi:10.2307/2806481. JSTOR 2806481. S2CID 24260292.
  5. Nitta, Joel H.; Schuettpelz, Eric; Ramírez-Barahona, Santiago; Iwasaki, Wataru; et al. (2022). "An Open and Continuously Updated Fern Tree of Life". Frontiers in Plant Science. 13: 909768. doi:10.3389/fpls.2022.909768. PMC 9449725. PMID 36092417.
  6. "Tree viewer: interactive visualization of FTOL". FTOL v1.5.0 [GenBank release 256]. 2023. Retrieved 17 August 2023.


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