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The Pteridophyte Phylogeny Group (PPG) is an informal international group of systematic botanists who collaborate to establish on the classification of pteridophytes (lycophytes and ferns) that reflects knowledge about plant relationships discovered through phylogenetic studies. In 2016, the group published a classification for extant ...
Psilotopsida 2 orders (whisk ferns and ophioglossoid ferns) ~92 species; Marattiopsida 1 order, Marattiales ~ 150 species; Polypodiopsida (Filicopsida) 7 orders (leptosporangiate ferns) ~ 9,000 species; In addition they defined 11 orders and 37 families. [19] That system was a consensus of a number of studies, and was further refined.
The tree ferns are arborescent (tree-like) ferns that grow with a trunk elevating the fronds above ground level, making them trees. Many extant tree ferns are members of the order Cyatheales, to which belong the families Cyatheaceae (scaly tree ferns), Dicksoniaceae, Metaxyaceae, and Cibotiaceae. It is estimated that Cyatheales originated in ...
There are 5 species of cycad listed as Extinct in the Wild: Encephalartos brevifoliolatus, Escarpment cycad. Encephalartos heenanii, Heenan's Cycad. Encephalartos nubimontanus, Blue cycad. Encephalartos relictus, Parlota cycad. Encephalartos woodii, Wood's cycad. Encephalartos woodii is known only from its type specimen, which was discovered in ...
Azolla (mosquito fern, duckweed fern, fairy moss, water fern) is a genus of seven species of aquatic ferns in the family Salviniaceae. They are extremely reduced in form and specialized, looking nothing like other typical ferns but more resembling duckweed or some mosses .
Dryopteris / draɪˈɒptərɪs /, [2] commonly called the wood ferns, male ferns (referring in particular to Dryopteris filix-mas), or buckler ferns, is a fern genus in the family Dryopteridaceae, subfamily Dryopteridoideae, according to the Pteridophyte Phylogeny Group classification of 2016 (PPG I). [3] There are about 300-400 species in the ...
Species. See text. Polypodium is a genus of ferns in the family Polypodiaceae, subfamily Polypodioideae, according to the Pteridophyte Phylogeny Group classification of 2016 (PPG I). [1] The genus is widely distributed throughout the world, with the highest species diversity in the tropics. The name is derived from Ancient Greek poly ("many ...
The order Cyatheales, which includes most tree ferns, is a taxonomic order of the fern class, Polypodiopsida. [2] No clear morphological features characterize all of the Cyatheales, but DNA sequence data indicate the order is monophyletic. Some species in the Cyatheales have tree-like growth forms from a vertical rhizome, others have shorter or ...