[[Paypay:Athyrium filix-femina.jpg|thumbnail|ugbos san pako]]
An '''Pako''' mao in sayo na grupo sin mga [[tanaman]] na maabot 12,000 na specie sakob sa ''Pteridophyta'' <ref name="chapman">{{cite web|url=http://www.environment.gov.au/biodiversity/abrs/publications/other/species-numbers/index.html |title=Numbers of Living Species in Australia and the World. Report for the Australian Biological Resources Study. Canberra, Australia. September 2009.|last= Chapman|first= Arthur |publisher=Environment.gov.au |date=2010-08-26 |accessdate=2013-09-07}}</ref>. May ada an pako matugas na lawas ngan dahon an pako sugad san iba na mga tanaman na ''vascular'', diri pareho san ''moss''. Waray ini liso ngan bukad kudi mayaon ini ''spores''.
