Corybas diemenicus (Lindl.) Rupp

Plant: small, 3- 5 cm high terrestrial or epiphyte. 

Tuber: ellipsoid or ovoid. 4 - 10 by 3 - 7 mm.  

Stem: 8 - 25 mm high, 2-ribbed, glabrous. 

Cataphyll: subinfundibuliform, 4-6 mm long, apiculate, glabrous. 

Leaves: lustrous light green above, greyish below; orbicular-cordate to broadly ovate, sometimes 3 - 5-lobed, 10 - 20 by 8 - 15 mm, retuse and apiculate at tip, cordate at base, cuneate at very base, midrib slightly grooved above mainly in basal part, prominent below, basal nerves 3 on either side of midrib, only the inner one reaching apical part of limb, suprabasal nerves 3 or 4 on either side of midrib, branched or unbranched, connate to inner basal nerve; with scattered pellucid lenticels and somewhat more along margins. 

Pedicel: 0.5 - 2 mm long. 

Bract: triangular-ovate, 1.5 - 3 mm long, acute. 

Ovary: obliquely ellipsoid, 4 - 6 mm long, 6-ribbed, glabrous. 

Flower: reddish purple, median sepal wine red flecked, Boss of lip creamy yellow. 

Median sepal: broadly obovate, 14 - 16 by 12 - 15 mm, broadly cucullate, rounded and obtusely apiculate at tip, 3-nerved at base, 18-nerved near margin, glabrous. 

Lateral sepals: free, sometimes adhering to each other (?), linear, 3 - 5 mm long, acute or bifid at tip, glabrous. 

Lateral petals: free or sometimes adhering to each other, linear, 3 - 5 mm long, acute or bifid at tip, glabrous. 

Lip: white with numerous purplish blotches, spots and veins, tubular in basal 13 - 15 mm, abruptly curved downward and spreading into a suborbicular 10 - 15 by 10 - 15 mm large limb, 2-lobed, emarginate, coarsely dentate along most of its margin but at tip with somewhat longer fimbriae, base 3-nerved, up to 14- nerved near margin, on inside finely hispid-pilose mainly between boss and tip;

Boss: conoid, glabrous, creamy yellow

Auricles: not known   

Capsule: ellipsoid. 10 - 12 mm long. Peduncle elongated up to 14 mm.

Type: lectotype: Nash 981 (NSW).

Distribution: New South Wales, Palarang Range (Adams 708). - Australian Capital Territory, Lee's Creek (Adams 751). - Victoria, McEachern’s Cave (Willis s.n.) - South Australia, E of Hohndorf (Nash 23); Comaum Pine Forest (Nash 353); Desert Camp (Nash 355); S part of Coorong (Nash 270); Kuitpo Forest (Nash 705); W of Clarendon (Nash 756); Cherry Gardens Oval (Nash 867); Coromandel Valley (Nash 868); Peso's Hill (Nash 867); Montarute (Nash 955); Lucindale area (Nash 959); Mt Lofty Range (Black s.n., Cleland s.n., Nash s.n., Pocock 1, Smith 132, Spooner 1427); Fleurieu Peninsula (Cleland s.n., Hunt 3233): Bool Lagoon (Cleland s.n.); Coles (Hunt 927); Robertson (Hunt 893, 894, 2046); Mt Gambier Aerodome (Wilson 454), Mt Hatch (Lothian 2911); Kangaroo Island (Jackson 253); Mt Gambier (Wilson 464 b); near Adelaide (Lam 7275). - Tasmania, N. coast (Nash 965, 981).

Ecology: In cool and sheltered places, often forming extensive colonies near coastal shrubs, in moist rocky defiles or epiphytic on tree fern trunks in mountain fern gullies  Elevation: 200 - 700 m