Corybas karoensis J.B.Comber & J.Dransf.

Tuber: ovoid, 7-8 x 4-6 mm. 

Rhizomes: radiating from the base, densely villous 

Stem: 5-8 cm by 2 mm, angled 

Cataphyll: triangular, acute, folded, 7 x 3 mm 

Leaf: sessile, cordate, acuminate, the margins conspicuously undulate, the veins slightly raised, dull bluish-green with paler veins above, shiny glaucous grey-green below, main vein 16 mm long, lamina 16 mm wide at the widest point, basal lobes 5 x 8 mm, slightly overlapping  

Bract: erect, translucent, keeled, 12-20 x 1.5 mm  

Ovary: 5 x 2.5 mm  

Dorsal sepal: truncate, gradually narrowed basally to a claw, in all 23 mm long, 4 mm broad basally, to 6mm in the center, expanding to 12-16 mm broad at the apex, apical margin irregularly denticulate, 7-9 veined in the central part, the veins branching towards the apex, abaxially roughened, with very sparsely distributed crystal bundles scattered throughout, dark crimson throughout 

Lateral sepals: 53 mm long by 1mm broad at the base, terete, free, deep crimson apically, paler basally, sometimes white throughout 

Lateral petals: similar or slightly shorter, deep crimson apically, paler basally, sometimes white throughout 

Labellum: with 13-15 veins, the basal 7-10 mm erect, then reflexed to form the blade, oval in outline, 14-15 x 11-13 mm, the margins slightly inrolled, not clasping the dorsal sepal, margin coarsely dentate to fimbriate, blade on adaxial surface covered with evenly distributed, rather dense and short hairs, basally dark crimson, blade margins dark crimson, central part bright crimson, pink, to nearly white  

Spurs: divergent, conical, 2-3 x 1.5mm, dark crimson  

Column: 2.2 x 1.5 mm.  

Type: Sumatra, J.B. Comber 1716A (Holotypus K; isotypus BO) 

Distribition: SUMATRA. North Sumatra, Merek- Sidikalang road, 1515m, 16 Feb. 1988, J.B. Comber 1716A (holotype K; isotype BO); 22 Feb. 1988, J.B. Comber 1746 (K). Lau Kawar, 1500 m, J.J, Wood 970 (K)

Ecology: Ridge top in montane forest in light shade, in leaf litter.