Isoetes pusilla Marsden & Chinnock

Small Quillwort

Muelleria 8: 57 (1993) APNI

Taxonomic status:Accepted

Occurrence status:Endemic

Establishment means:Native

Threat status:Victoria: endangered (e); listed in Flora and Fauna Guarantee Act 1988

Leaves erect or recurved, 2–6 cm long; base dilated, overlapping, spoon-shaped, lateral margins translucent. Megasporangia orbicular to elliptical, 2–3 mm long, wall pale, thin, usually covered completely by membranous velum; megaspores 10–20 per sporangium (in outer leaves), whitish-grey, monomorphic, spherical; surface ornamented with narrow, low, sharp, anastomosing ridges which become netted on distal faces. Microsporangia present, microspores numerous.

Gold, NIS. Vic. -WIM, MID, VOLC (EHR). Restricted mainly to the Chiltern-Beechworth area, with isolated occurrences in western Victoria, and only known from shallow rock pools.

Isoetes pusilla differs from I. muelleri in its megaspore wall markings, in having only one type of megaspore, and in the production of microspores. Generally, I. pusilla is a smaller plant than I. muelleri.

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 pusilla in AVH ; Victorian Biodiversity Atlas, © The State of Victoria, Department of Environment and Primary Industries (published Dec. 2014) Find Isoetes pusilla in Victorian Biodiversity Atlas
  Bioregion Occurrence status Establishment means
Goldfields present native
Northern Inland Slopes present native

State distribution

Distribution map
New South Wales