Diplazium australe is a species of fern in the family Athyriaceae. It is native to eastern Australia, where it occurs in moist forest habitats.
Taxonomy
- Kingdom: Plantae
- Division: Pteridophyta
- Class: Polypodiopsida
- Order: Polypodiales
- Family: Athyriaceae
- Genus: Diplazium
- Species: Diplazium australe
The species authority is (R.Br.) C.Chr., indicating the original description by Robert Brown and later reassignment by Carl Christensen.
Description
Diplazium australe is a terrestrial fern characterized by fronds that are typically pinnate to bipinnate. The fronds arise from a short, erect rhizome and can reach lengths of up to 1 m. The pinnae are lanceolate to oblong, with finely serrated margins. Sori are linear, arranged along the veins on the underside of the fronds, and are covered by indusia that are peltate (shield‑shaped).
Distribution and habitat
The species is recorded from coastal and sub‑coastal regions of New South Wales and Queensland. It grows in shaded, damp environments such as rainforest gullies, wet eucalypt forests, and near streams. It prefers well‑drained, organic‑rich soils and often occupies the forest floor under a canopy of taller vegetation.
Ecology
As a shade‑tolerant fern, Diplazium australe contributes to the understory plant community, providing habitat and moisture retention in forest ecosystems. Its fronds may serve as a food source for certain herbivorous insects, although specific ecological interactions have not been extensively documented.
Conservation status
In the Australian states where it occurs, Diplazium australe has not been listed as threatened and is considered relatively common within suitable habitats. Ongoing habitat preservation is important for maintaining its populations.
References
- Australian Plant Census (APC). Diplazium australe entry.
- Flora of Australia, Volume 46 – Ferns and Fern Allies (Athyriaceae).
- Queensland Herbarium, species profile for Diplazium australe.
