Blechnum nudum (Labill.) Mett. ex Luerss.

Verst. Heimatl. Fl. 292 (1806) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Rhizome erect, thick; sometimes forming trunk. Fronds tufted, erect, thinly leathery, 40–60 (rarely to 120) cm tall; sterile and fertile fronds dissimilar; young fronds yellow-green. Stipe short, comparatively thick, black and shiny; scales near base long, dark and shiny. Sterile frond lamina broad-lanceolate, once pinnate, mid-green, paler below; pinnae close-set, usually straight and perpendicular to rachis (often somewhat curved towards top of frond), attached by wide bases, narrowly oblong, margins entire, apices acute to rounded; lower pinnae much reduced in size, rounded. Fertile fronds stiffly erect, shorter than sterile fronds; pinnae numerous, separated, short, slightly curved, coarse. Sori covering underside of lamina on each side of midvein. Fishbone Water-fern,

CVU, DunT, EGL, EGU, GipP, Glep, Gold, GGr, HFE, HNF, HSF, MonT, NIS, OtP, OtR, SnM, Strz, VAlp, VRiv, VVP, WaP, WPro. Also SA, Qld, NSW, Tas. (including Bass Strait islands). Common along forested stream banks, in deeply shaded gullies and alluvial flats, occasional in more exposed situations in poorly drained areas.

In exposed sites fronds are often yellowish and stunted, while under ideal conditions the middle pinnae may be pinnately divided ('crested' growth form). Although pinnae on sterile fronds are usually quite elongate and tapering, some plants have shorter pinnae with rounded ends. The black, shiny stipe and the stiff fertile fronds (produced amid a tuft of sterile fronds) are distinctive.

Source: Entwisle, T.J. (1994). Ferns and allied plants (Psilophyta, Lycopodiophyta, Polypodiophyta). In: Walsh, N.G.; Entwisle, T.J. (eds), Flora of Victoria Vol. 2, Ferns and Allied Plants, Conifers and Monocotyledons. Inkata Press, Melbourne.
Updated by: Val Stajsic, 2021-01-12
Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
order Polypodiales
family Blechnaceae
genus Blechnum
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <>. Find Blechnum nudum in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Blechnum nudum in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Glenelg Plain present native
Victorian Volcanic Plain present native
Victorian Riverina present native
Gippsland Plain present native
Otway Plain present native
Warrnambool Plain present native
Goldfields present native
Central Victorian Uplands present native
Greater Grampians present native
Dundas Tablelands present native
Northern Inland Slopes present native
East Gippsland Lowlands present native
East Gippsland Uplands present native
Wilsons Promontory present native
Highlands-Southern Fall present native
Highlands-Northern Fall present native
Otway Ranges present native
Strzelecki Ranges present native
Monaro Tablelands present native
Highlands-Far East present native
Victorian Alps present native
Snowy Mountains present native

State distribution

Distribution map
South Australia
New South Wales
Australian Capital Territory