Genoplesium tectum is a terrestrial,
perennial,
deciduous,
herb with an underground
tuber and a single thin leaf with a reddish base and long, fused to the flowering stem with the free part long. Between five and thirty flowers are well spaced along a flowering stem long, reaching to a height . The flowers lean downwards, are light red, about long and wide. As with others in the
genus, the flowers are inverted so that the labellum is above the
column rather than below it. The
dorsal sepal is broadly egg-shaped, about long, wide and light reddish with prominent reddish-black bands. The
lateral sepals are linear to lance-shaped, about long, wide, have a small
gland on their tips and spread widely apart from each other. The
petals are narrow egg-shaped, about long and wide with dark reddish bands. The labellum is elliptic to egg-shaped with the narrower end towards the base, about long, wide with its edges densely covered with short, purplish hairs. There is a dark reddish-black
callus in the centre of the labellum and extending almost to its tip. Flowering occurs from November to March. ==Taxonomy and naming==