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Blechnum petiolare is a species of fern in the family Blechnaceae. It is endemic to Ecuador and known only from Bolívar Province. When it was first described in the early 20th century, it was known from Chillanes but this area has been heavily disturbed and the species continues to be threatened.

Blechnum petiolare
Conservation status
Data Deficient  (IUCN 3.1)[1]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Division:	Polypodiophyta
Class:	Polypodiopsida
Order:	Polypodiales
Suborder:	Aspleniineae
Family:	Blechnaceae
Genus:	Blechnum
Species:	B. petiolare
Binomial name
Blechnum petiolare (Sodiro) C.Chr.

Its natural habitat is subtropical or tropical moist montane forests. It is threatened by habitat loss for fires and deforestation including agriculture.

The Checklist of Ferns and Lycophytes of the World regards it as a possible synonym of Austroblechnum lehmannii.[2]

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