Hymenophyllum rarum R.Br.

Narrow Filmy-fern

Prodr. 159 (1810) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Rhizome creeping, slender, thread-like, without hairs. Fronds distant or crowded, often pendent, 5–15 cm long. Stipe short, slender, usually not winged, sometimes with a few hairs at base. Rachis slender, narrowly winged. Lamina 1–2-pinnate, narrowly oblong to ovate, pale grey-green, dull; ultimate segments linear to oblong, comparatively broad; margin entire; apex blunt. Sori towards tip of frond, terminal on lateral pinnae segments, partly immersed in lamina; indusium 2-lipped, narrower than segment, more or less rhomboidal, apical margins entire; V-shaped lower edges of indusium bordered by a forked vein; receptacle short.

EGL, EGU, GGr, HFE, HNF, HSF, OtP, OtR, SnM, Strz, VAlp, WaP, WPro. Also NSW, Tas. (including Bass Strait islands). New Zealand. Scattered and not common across southern Victoria, frequently occurring on lower trunks of Nothofagus.

Often growing among other filmy-ferns and superficially resembling H. cupressiforme and H. peltatum. As with H. peltatum, the pinnae are often divided on one side only. Unlike both these species, however, the pinnae of H. rarum do not have serrate margins. See also notes under H. flabellatum.

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.
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Distribution map
Higher taxa

Victoria

Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <http://avh.chah.org.au>. Find Hymenophyllum rarum in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Hymenophyllum rarum in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Otway Plain present native
Warrnambool Plain present native
Greater Grampians 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
Highlands-Far East present native
Victorian Alps present native
Snowy Mountains present native

State distribution

Distribution map
State
New South Wales
Victoria
Tasmania