Isoetes muelleri A.Braun
Common Name: Isoetes, Quillwort
Description: Amphibious or aquatic plants; corm 2- or 3-lobed. Leaves 5-25 per plant, erect or slightly recurved, 3-12 cm long, c. 1.5 mm diam., dark green; base c. 4 mm wide, white. Sporangia spheroidal or ellipsoidal, 2.5-6 mm long; velum covering the sporangium. Fertile megaspores 0.4 -0.5 mm diam., drying grey; all faces similarly ornamented with small ridges which may or may not be confluent.
Introduced Status: Native to NT
Distribution Notes: In NT mostly collected from arid regions.
Bioregion: Arnhem Plateau, Burt Plain, Central Ranges, Davenport Murchison Ranges, Great Sandy Desert, Gulf Fall and Uplands, MacDonnell Ranges, Mitchell Grass Downs, Pine Creek, Stony Plains, Victoria Bonaparte
Habitat: A highly polymorphic species in a broad range of habitats, from ephemeral pools in arid regions to alpine tarns.This description applies to the two known collections gathered in the Top End from Mt Brockman and Mt Gilruth. At the former locality plant were growing in c. 20 cm deep water in a creek on the sandstone massif. At the latter location they were growing in wet sandy soil shaded by overhanging sandstone.
Flowering: Fertile plants: Mar-Apr
Fruiting: Fertile plants: Mar-Apr
Conservation Status (TPWCA): Least Concern
Restricted Range Taxon: N
NT Parks: Kakadu National Park, Limmen National Park, Nitmiluk National Park, Tjoritja / West MacDonnell National Park, Trephina Gorge Nature Park, Uluru-Kata Tjuta National Park, Watarrka National Park
Flora Description Source: Floodplain Flora - A flora of the coastal floodplains of the Northern Territory, Australia
Taxonomic Literature: Short, P., Dixon, D. and Osterkamp Madsen, M. 2003, A review of ferns and fern allies of the Northern Territory, The Beagle, Records of the Museums and Art Galleries of the Northern Territory, vol. 19, pp. 12-13.