Asplenium unisorum

{{Short description|Species of fern}}

{{Speciesbox

|status=CR

|status_system=IUCN3.1

|status_ref={{cite iucn |author=Keir, M. |author2=Sugii, N. |author3=Gon, S.M. |author4=Chau, M. |author5=Kwon, J. |author6=Weisenberger, L. |year=2016 |errata=2017 |title=Asplenium unisorum |page=e.T78775516A115493966 |doi=10.2305/IUCN.UK.2016-1.RLTS.T78775516A78775751.en}}

|status2=LE

|status2_system=ESA

|status2_ref={{cite web |url=https://ecos.fws.gov/ecp/species/8461 |title=No common name (Asplenium unisorum) |website=Environmental Conservation Online System |publisher=U.S. Fish & Wildlife Service |access-date=20 June 2024}}{{cite journal |title=Endangered and Threatened Wildlife and Plants; Endangered Status for Three Plants From the Waianae Mountains, Island of Oahu, HI |journal=Federal Register |pages=32932–32938 |volume=59 |issue=122}}

|genus=Asplenium

|species=unisorum

|authority=(Wagner) Viane{{GBIF |id=4258717 |title=Asplenium unisorum (Wagner) Viane) |access-date=1 January 2025}}

|synonyms=Diellia unisora Wagner

|synonyms_ref=

}}

Asplenium unisorum, the singlesorus island spleenwort,{{ITIS|taxon=Asplenium unisorum (W.H. Wagner) Viane |id=897129 |access-date=20 June 2024}} is a species of fern endemic to the Hawaiian Islands. It only lives between 650 and 700 m in the Wai'anae Mountains on the island of O'ahu. It is classified as critically endangered, with a fragmented, actively shrinking mature population of around 1,148.