Andrew G. Murdock

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

Ptisana salicina, commonly known as para, tawhiti-para, king fern, or horseshoe fern, is a species of fern native to Norfolk Island, New Zealand and the South Pacific. It has fronds up to 5 metres (16 ft) long that arise from a starchy base that was a traditional food for the Maori.

Ptisana purpurascens is a species of fern in the family Marattiaceae that is endemic to Ascension Island. It is considered a critically endangered species.

Ptisana oreades is a species of terrestrial fern in the family Marattiaceae. It is native to northeast Queensland, Australia, where it grows in rainforested areas close to water courses, from the McIlwraith Range on Cape York Peninsula south along the east coast to about the Eungella National Park west of Mackay.

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Ptisana howeana is a rare fern endemic to Lord Howe Island, occasionally found in cultivation. The local names are horse shoe fern or king fern. A large plant, though not particularly tall. The fronds grow to four metres long. The habitat is near streams in dense forest at the southern part of Lord Howe Island, near Mount Lidgbird and Mount Gower.

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