Ctenitis sloanei (commonly known as the Florida tree fern, red hair comb fern, Bermuda cave fern, or Florida lacefern) is a species of wood fern native to USA (Florida), Bermuda, Cuba, the Caribbean, Mexico, Central America, and northwestern South America. Although it does not belong to the order Cyatheales (the group that contains most tree ferns), it is still considered by some to be a type of tree fern. This would make it the only tree fern native to the continental United States (the parts of the US that exclude Hawaii, Alaska and overseas territories). A member of the genus Ctenitis, it was formerly classified under the genus Dryopteris as Dryopteris ampla. The population of this fern has been damaged and it is noted to possibly be endangered.
>>>PUT SHARE BUTTONS HERE<<<
Ctenitis sloanei in the context of Tree ferns
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 the early Jurassic, and is the third group of ferns known to have given rise to tree-like forms. The others are the extinct Tempskya of uncertain position, and Osmundales where the extinct Guaireaceae and some members of Osmundaceae also grew into trees. In addition there were the Psaroniaceae including Tietea in the Marattiales, which is the sister group to all the leptosporangiate ferns.
Other tree ferns include Leptopteris and Todea in the family Osmundaceae, which can achieve short trunks under a metre tall. Osmunda regalis is sometimes considered a tree fern. Fern species with short trunks in the genera Blechnum, Cystodium and Sadleria from the order Polypodiales and smaller members of Cyatheales like Calochlaena, Cnemedaria, Culcita, Lophosoria and Thyrsopteris are also considered tree ferns. The species Ctenitis sloanei (Florida tree fern) from Florida, Mexico, Bermuda and the Caribbean is sometimes called a tree fern. Like all ferns, tree ferns reproduce by means of spores formed on the undersides of the fronds.