There is a thin, yellow, channelled callus in the centre of the labellum and extending just past the bend.

[2][3][4][5] Prasophyllum spicatum was first formally described in 1991 by Robert Bates and David Jones from a specimen collected near Dergholm State Park and the description was published in Australian Orchid Research.

[2] The dense leek orchid grows in near-coastal heath between Mount Gambier in eastern South Australia and Wilsons Promontory in south-eastern Victoria, although it is absent from the Otway district.

Accurate determination of population size is difficult because of the sometimes dense heath where the orchid grows and its tendency to flower more often after fire.

It is listed as "Endangered" under the South Australian National Parks and Wildlife Act 1972.