Seeds of South Australia
Isoetes muelleri (Isoetaceae)
Rock Quillwort
List of species for Isoetes
Display more images
Click on an image to enlarge it
Herbarium regions:
North Western, Lake Eyre, Flinders Ranges, Eastern, Eyre Peninsula, Northern Lofty, Southern Lofty, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Alinytjara Wilurara, Eyre Peninsula, Northern and Yorke, South Australian Arid Lands, South East
IBRA regions
SUMMARY
Lucindale (NCP03)Naracoorte Coastal Plain
 Vulnerable   (IUCN: VU D2)
Tintinara (NCP04) 
 Vulnerable   (IUCN: VU D2)
Fleurieu (KAN02)Kanmantoo
 Endangered   (IUCN: EN B2ab(i,ii,iii))   (Probable Decline)   [on red-gum flats; habitat quality declined]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Endangered   (IUCN: EN B2ab(i,ii,iii))   (Probable Decline)   [no vouchered records; on red-gum flats; habitat quality declined]
Southern Flinders (FLB04) 
 Endangered   (IUCN: EN D)   (Definite Decline)
Northern Flinders (FLB05) 
 Near Threatened   [undercollected, only appears after rain/floods; mostly ephemeral; uncommon]
St Vincent (EYB02)Eyre Yorke Block
 Endangered   (IUCN: EN D)   (Definite Decline)
Eyre Hills (EYB03) 
 Vulnerable   (IUCN: VU D2)   [probably undercollected, deciduous]
Eyre Mallee (EYB05) 
 Vulnerable   (IUCN: VU D2)   [probably undercollected, deciduous]
Wimmera (MDD05)Murray Darling Depression
 Vulnerable   (IUCN: VU D2)
Kintore (GVD04)Great Victoria Desert
 Near Threatened   [undercollected, only appears after rain/floods; mostly ephemeral; uncommon]
Bimbowrie (BHC05)Broken Hill Complex
 Endangered   (IUCN: EN D)   (Definite Decline)
Breakaways (STP01)Stony Plains
 Near Threatened   [undercollected, only appears after rain/floods; mostly ephemeral; uncommon]
Oodnadatta (STP02) 
 Near Threatened   [undercollected, only appears after rain/floods; mostly ephemeral; uncommon]
Witjira (STP06) 
 Near Threatened   [undercollected, only appears after rain/floods; mostly ephemeral; uncommon]
Baltana (STP07) 
 Near Threatened   [undercollected, only appears after rain/floods; mostly ephemeral; uncommon]
Mann-Musgrave Block (CER01)Central Ranges
 Near Threatened   [undercollected, only appears after rain/floods; mostly ephemeral; uncommon]
Watarru (CER02) 
 Near Threatened   [undercollected, only appears after rain/floods; mostly ephemeral; uncommon]
IBRA regions
DISPLAY ALL
2 of 4 subregionsNaracoorte Coastal PlainVulnerable
Fleurieu (KAN02)KanmantooEndangered
  (IUCN: EN B2ab(i,ii,iii))   (Probable Decline)   [on red-gum flats; habitat quality declined]
3 of 6 subregionsFlinders Lofty BlockNear Threatened
, Endangered
3 of 5 subregionsEyre Yorke BlockVulnerable
, Endangered
Wimmera (MDD05)Murray Darling DepressionVulnerable
  (IUCN: VU D2)
Kintore (GVD04)Great Victoria DesertNear Threatened
  [undercollected, only appears after rain/floods; mostly ephemeral; uncommon]
Bimbowrie (BHC05)Broken Hill ComplexEndangered
  (IUCN: EN D)   (Definite Decline)
4 of 7 subregionsStony PlainsNear Threatened
2 of 3 subregionsCentral RangesNear Threatened
RSCA map:
Regional Species Conservation Assessments per IBRA subregion. Please click the thumbnail map.
AVH map:
Australian distribution map (external link)
SA Census:
Census of South Australian plants (external link)     [genus Isoetes]
Name derivation:
Isoetes from the Greek 'isos' meaning alike and 'etos' meaning year; referring to the submerged species remaining evergreen throughout the year. Muelleri named after Baron Ferdinand von Muller (1825-1896), botanist, plant collector and Government Botanist of Victoria.
Distribution:
Found scattered across South Australia along a band from the north-western corner to the south-eastern corner, growing submerged in rock pools, slow-moving streams and small lakes, where it growth can continue year-round, or in damp soil near temporary water, growing from late autumn to spring. Also found in all states.
Status:
Native. Uncommon in South Australia. Uncommon in New South Wales. Common in the other states.
Plant description:
Leaves erect or somewhat lax, to 30 cm long, apex narrowly cylindric, gradually wider towards the base, with the base abruptly wider, flattened, loosely overlapping, spoon-shaped, lateral margins pale and papery. Spore structure (sporangia) orbicular to elliptical, to 6 mm long, wall pale, thin. Megaspores are found in the outer leaves, whitish-grey, dimorphic, variable in size and ornamentation, larger spores almost spherical, smaller spores flatter, almost hemispherical with surface markings on all spores rounded (not angular), with few tubercles, markings sometimes absent. Microspores absent, inner leaves sterile.
Fruit type:
Megaspores found in the hollow leaf base of the outer leaves.
Seed type:
White-grey megaspores.
Seed collecting:
Check to seed if the plant has any spores by pulling a leaf out of the ground from the base and looking inside the fat, hollow leaf base for a sack of white-grey megaspores. If present, pull off a few of the leaves and place in a seal paper bags to prevent spores from fulling out.
Seed cleaning:
Leave the spores in the paper bag to dry. Then remove the leaf covering carefully to expose the spore sack. Store the spores in an air tight container in a cool and dry place or in a -20oC freezer.