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''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. ''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.〔 ''Ptisana'' has a palaeotropical distribution, with the westernmost extreme of the range in Ascension Island and extending eastward through tropical Africa, Asia, and Oceania. The basal chromosome number for this genus is ''2n=78'', whereas the one count for ''Marattia'' in the strict sense is ''2n=80''. 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 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 melanesica'' (Kuhn) Murdock – New Guinea and nearby islands *''Ptisana obesa'' (Christ) Murdock – New Guinea *''Ptisana squamosa'' (Christ) Murdock – New Guinea *''Ptisana grandifolia'' (Copel.) Murdock – New Guinea *''Ptisana novoguineensis'' (Rosenst.) Murdock – New Guinea *''Ptisana oreades'' (Domin) Murdock – northern Australia *''Ptisana howeana'' (W.R.B. Oliver) Murdock – Lord Howe Island *''Ptisana rigida'' (Alderw.) Murdock – New Guinea, Sulawesi *''Ptisana platybasis'' (Copel.) Murdock – New Guinea *''Ptisana costulisora'' (Altson) Murdock – New Guinea and nearby islands 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ptisana」の詳細全文を読む スポンサード リンク
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