Asplenium unisorum

Asplenium unisorum, the singlesorus island spleenwort,^[5] is a species of fern endemic to the Hawaiian Islands.^[1] It only lives between 650 and 700 m in the Wai'anae Mountains on the island of O'ahu.^[1] It is classified as critically endangered, with a fragmented, actively shrinking mature population of around 1,148.^[1]

Asplenium unisorum
Conservation status
Critically Endangered  (IUCN 3.1)[1]
Endangered (ESA)[2][3]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Division:	Polypodiophyta
Class:	Polypodiopsida
Order:	Polypodiales
Suborder:	Aspleniineae
Family:	Aspleniaceae
Genus:	Asplenium
Species:	A. unisorum
Binomial name
Asplenium unisorum (Wagner) Viane[4]
Synonyms[4]
Diellia unisora Wagner

Description

It grows 0.5-3.0cm tall, with a 0.5-1.0cm diameter.^[6] Leaf stalks branch off the main stem, which also features a few "small black scales".^[6] The stalks themselves are "black and shiny", around 2.0-5.0cm long.^[6] Branching off from the stalks, the fronds of the fern are 8.0-30.0cm tall by 0.5-3.0cm broad.^[6]