Fl. Ins. Austr. 80 (1786) APNI
Two subspecies have been recognised in Asplenium obtusatum. Each subspecies corresponds to a separate ploidy level with the nominate subspecies tetraploid and Asplenium obtusatum subsp. northlandicum octoploid. The two ploidy levels differ in spore size and in scale shape. Australian material of A. obtusatum have scales that are narrowly triangular and produce spores with mean lengths of 43.8–54.6 µm long (Brownsey 1998) consistent with Asplenium obtusatum subsp. northlandicum. Asplenium obtusatum subsp. northlandicum was shown to be most likely an allooctoploid with Asplenium obtusatum and an unknown species as its parents (Shepherd et al. 2008). It is general practice in fern taxonomy to recognise allopolyploids at the rank of species (Barrington et al. 1989) and consequently the octoploid is recognised at species rank in New Zealand but under the name Asplenium decurrens Willd. which is an earlier name for Asplenium northlandicum and takes preference (Brownsey & Perrie 2016). In Australia this taxon is still recognised at subspecies rank following previous Australian treatments (e.g. Brownsey 1998). See subspecies profile for description.
EGL, GipP, VVP, WPro.
|Bioregion||Occurrence status||Establishment means|
|Victorian Volcanic Plain||present||native|
|East Gippsland Lowlands||present||native|
|New South Wales|
|Australian Capital Territory|