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Psilotum
''Psilotum'' (whisk fern) is a genus of fern-like vascular plants, one of two genera in the family Psilotaceae, order Psilotales, and class Psilotopsida (the other being ''Tmesipteris''). The name of the genus is from Greek ''psilos'' = bare, referring to the lack of the usual plant organs, such as leaves.〔(Etymology of Psilotum )〕
==Species and distribution==
There are two species, ''Psilotum nudum'' and ''Psilotum complanatum'', with a hybrid between them known, ''Psilotum'' × ''intermedium'' W. H. Wagner.
The distribution of ''Psilotum'' is tropical and subtropical, in the New World, Asia, and the Pacific, with a few isolated populations in SW Europe. The highest latitudes known are in South Carolina, Cádiz province in Spain,〔(【引用サイトリンク】 work = Atlas y Libro Rojo de la Flora Vascular Amenazada de España )〕 and southern Japan for ''P. nudum''. In the U.S., one species is found from Florida to Texas, the other in Hawaii.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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