Icarus filiformis

Icarus filiformis
	Icarus filiformis in Christchurch Botanic Gardens
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Division:	Polypodiophyta
Class:	Polypodiopsida
Order:	Polypodiales
Suborder:	Aspleniineae
Family:	Blechnaceae
Genus:	Icarus; Gasper & Salino
Species:	I. filiformis
Binomial name
	Icarus filiformis; (A.Cunn.) Gasper & Salino
Synonyms
	Blechnum filiforme (A.Cunn.) Ettingsh. ; Blechnum reptans (Banks & Sol. ex G.Forst.) Luerss. ; Lomaria filiformis A.Cunn. ; Lomaria pimpinellifolia Hook.f. ; Lomaria propinqua A.Cunn. ; Lomariopsis heteromorpha (Sm.) T.Moore ; Osmunda reptans Banks & Sol.ex G.Forst. ; Spicanta filiformis (A.Cunn.) Kuntze ; Stenochlaena feejeensis Brack. ; Stenochlaena heteromorpha J.Sm. ; Struthiopteris filiformis (A.Cunn.) Ching ;

Icarus is a genus of ferns in the family Blechnaceae, subfamily Blechnoideae, with a single species Icarus filiformis, according to the Pteridophyte Phylogeny Group classification of 2016 (PPG I). The genus is accepted in a 2016 classification of the family Blechnaceae, but other sources sink it into a very broadly defined Blechnum, equivalent to the whole of the PPG I subfamily.

Icarus filiformis, synonym Blechnum filiforme, is known as thread fern or pānoko in Māori. It is endemic to New Zealand. It has a creeping and climbing habit. It has three different types of fronds: long climbing fronds with long pointed leaves, shorter creeping fronds with nearly round leaves, and fertile fronds with threadlike leaves that give the species its common name.

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