[3] It was first described by Ferdinand von Mueller as Loranthus signatus in 1867 in George Bentham's Flora Australiensis,[1][4] but was assigned to the genus, Decaisnina, by Philippe van Tieghem in 1895.

[1][2] Decaisnina signata is a spreading to pendulous plant, with terete internodes.

The paired leaves are lanceolate to nearly orbicular, truncate or cordate at their base, and sessile or almost sessile, with the leaf blade 4–15 cm by 2.5-5.5 cm.

[5] The leaves are dull on both sides and have distinct venation.

[5] The fruit is ovoid to nearly globose, and about 10 mm long.