Parablechnum cordatum

{{Short description|Species of fern}}

{{Speciesbox

| image = Blechnum chilense 2.jpg

| taxon = Parablechnum cordatum

| authority = (Desv.) Gasper & Salino

| synonyms =

{{Species list

|Blechnum cordatum|(Desv.) Hieron.

|Blechnum arborescens|(Klotzsch & H.Karst.) Hieron

|Blechnum capense var.ornifolium|(C.Presl) Domin

|Blechnum chilense|(Kaulf.) Mett.

|Blechnum euraddianum|Brade

|Blechnum gilliesii|(Hook.& Grev.) Mett.

|Blechnum itatiaiense|Brade

|Blechnum macahense|Brade

|Blechnum ornifolium|(C.Presl) Ettingsh.

|Blechnum peruvianum|Hieron.

|Blechnum raddianum|Rosenst.

|Blechnum reedii|(Phil.) Espinosa

|Blechnum regnellianum|(Kunze) C.Chr.

|Blechnum simile|Sehnem

|Lomaria arborescens|Klotzsch & H.Karst.

|Lomaria brasiliensis|Raddi

|Lomaria chilensis|Kaulf.

|Lomaria cordata|Desv.

|Lomaria gilliesii|Hook.& Grev.

|Lomaria ornifolia|C.Presl

|Lomaria reedii|Phil.

|Lomaria regnelliana|Kunze

|Lomaria serrulosa|Desv.

|Lomaria spissa|Christ

|Orthogramma gilliesii|(Hook.& Grev.) C.Presl

|Parablechnum chilense|(Kaulf.) Gasper & Salino

|Spicanta capensis var.gilliesii|(Hook.& Grev.) Kuntze

|Spicanta capensis var.lechleri|(Mett.) Kuntze

|Struthiopteris brasiliensis|(Raddi) Maxon & Morton

|Struthiopteris gilliesii|(Hook.& Grev.) Ching

}}

| synonyms_ref =

}}

Parablechnum cordatum (synonyms Blechnum cordatum, Blechnum chilense), the Chilean hard fern or costilla de vaca (Chilean Spanish for "cow's rib"), is a fern of the family Blechnaceae, native to Chile. It is also found in neighboring areas of Argentina and the Juan Fernández Islands.

It grows to {{convert|0.9|-|1.8|m|0|abbr=on}}, often developing a trunk-like appearance over time. The fertile fronds are more erect, with narrower pinnae, than the infertile ones.{{cite book|title=RHS A-Z encyclopedia of garden plants|year=2008|publisher=Dorling Kindersley|location=United Kingdom|isbn=978-1405332965|pages=1136}}

This plant has gained the Royal Horticultural Society's Award of Garden Merit.{{cite web|title=RHS Plant Selector - Blechnum chilense|url=https://www.rhs.org.uk/Plants/22159/Blechnum-chilense/Details | accessdate=15 April 2020}}