Isoetes muelleri A.Braun

Monatsber. Konigl. Preuss. Akad. Wiss. Berlin 1868: 541 (1868) APNI

Taxonomic status:Accepted

Occurrence status:Present

Establishment means:Native

Leaves erect or somewhat lax, 5–30 cm long, apex narrowly cylindric, gradually wider towards base; bases abruptly wider, flattened, loosely overlapping, spoon-shaped, lateral margins pale and papery. Megasporangia orbicular to elliptical, 3–6 mm long, wall pale, thin, sporangium usually covered completely by membranous velum; megaspores 50–200 per sporangium (in outer leaves), whitish-grey, dimorphic, variable in size and ornamentation; larger spores almost spherical; smaller spores flatter, almost hemispherical; surface markings on all spores rounded (not angular), with few tubercles, markings sometimes absent. Microspores absent; inner leaves sterile.

CVU, DunT, EGL, EGU, GipP, Glep, Gold, GGr, HNF, HSF, LoM, MuF, MuM, NIS, RobP, SnM, VAlp, VRiv, VVP, Wim. Vic. -MMAL, LMAL, WIM, GR, RIV, VOLC, EHL, SNOW, EG (ACDHMNRVWZ)- all States. Usually submerged in rock pools, slow-moving streams and small lakes, where growth can continue year-round, but also known from temporary water, growing from late autumn to spring.

The endemic Tasmanian species Isoetes humilior F. Muell. ex A. Braun has thick, rigid, dark leaves crowning a corm with two rather elongate lobes, and only smooth-walled, large megaspores (Marsden 1976).

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.
Hero image
Distribution map
life Life
kingdom Plantae
phylum Tracheophyta
order Isoetales
family Isoetaceae
genus Isoetes
Higher taxa


Source: AVH (2014). Australia's Virtual Herbarium, Council of Heads of Australasian Herbaria, <>. Find Isoetes muelleri in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Isoetes muelleri in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Lowan Mallee present native
Murray Mallee present native
Wimmera present native
Glenelg Plain present native
Victorian Volcanic Plain present native
Victorian Riverina present native
Robinvale Plains present native
Murray Fans present native
Gippsland 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
Highlands-Southern Fall present native
Highlands-Northern Fall present native
Victorian Alps present native
Snowy Mountains present native

State distribution

Distribution map
Western Australia
Northern Territory
South Australia
New South Wales
Australian Capital Territory