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
Kingdom:	Plantae
Clade:	Tracheophytes
Class:	Polypodiopsida
Order:	Marattiales
Family:	Marattiaceae
Genus:	Ptisana Murdock
Species
See text.

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 dwarf species endemic to the Plateau de Dogny in New Caledonia. The basal chromosome number for Ptisana is 2n=78, whereas the one count for Marattia in the strict sense is 2n=80.[3] The type species is Ptisana salicina.

Species

• Ptisana fraxinea (Sm.) Murdock – Africa to India, including Indian Ocean islands
• Ptisana salicina (Sm.) Murdock – king fern; South Pacific islands, including New Guinea
• Ptisana salicifolia (Schrad.) Senterre & Rouhan – South Africa, Zimbabwe, Malawi and Mozambique
• Ptisana senterreana Christenh. – Cameroon, Gabon, Equatorial Guinea
• Ptisana africana Christenh. – East Africa
• Ptisana attenutata (Labill.) Murdock – New Caledonia
• Ptisana sambucina (Blume) Murdock – Malesia and Vietnam
• Ptisana sylvatica (Blume) Murdock – Malesia
• Ptisana pellucida (C. Presl) Murdock – Malaysia and the Philippines
• Ptisana mertensiana (C. Presl) Murdock – Micronesia
• Ptisana ternatea (de Vriese) Murdock – Moluccas, New Guinea, the Philippines
• Ptisana purpurascens (de Vriese) Murdock – Ascension Island
• Ptisana smithii (Mett. ex Kuhn) Murdock – Vanuatu, Fiji, Samoas, Tonga
• Ptisana wernerii (Rosenst.) Christenh.
• Ptisana melanesica (Kuhn) Murdock – New Guinea and nearby islands
• Ptisana boivinii (Mett. ex Kuhn) Senterre & Rouhan – Madagascar
• Ptisana obesa (Christ) Murdock – New Guinea
• Ptisana odontosora (Christ) Senterre & Rouhan – Guinea
• Ptisana squamosa (Christ) Murdock – New Guinea
• Ptisana grandifolia (Copel.) Murdock – New Guinea
• Ptisana rolandi-principis (Rosenst.) Christenh. – New Caledonia
• Ptisana koordersii Christenh. – Sulawesi
• Ptisana novoguineensis (Rosenst.) Murdock – New Guinea
• Ptisana oreades (Domin) Murdock – northern Australia
• Ptisana papuana (Alderw.) Murdock & C.W.Chen – Solomon Islands
• Ptisana howeana (W.R.B. Oliver) Murdock – Lord Howe Island
• Ptisana rigida (Alderw.) Murdock – New Guinea, Sulawesi
• Ptisana platybasis (Copel.) Murdock – New Guinea
• Ptisana boninensis (Nakai) Yonek. – Bonin Islands
• Ptisana costulisora (Altson) Murdock – New Guinea and nearby islands
• Ptisana robusta (Altson) Senterre & I.Fabre – São Tomé
• Ptisana laboudalloniana Senterre & I.Fabre – Seychelles
• Ptisana ambulans Murdock & C.W.Chen – Solomon Islands
• Ptisana decipiens Murdock & C.W.Chen – Solomon Islands

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. 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.