It has a single hairy leaf and up to three large, mainly white flowers with relatively short lateral sepals and petals.

It is similar to the reclining white spider orchid (C. cruscula) but that species has smaller, cream-coloured flowers.Caladenia longicauda subsp.

rigidula is a terrestrial, perennial, deciduous, herb with an underground tuber and which usually grows as solitary plants.

[2][3][4][5][6] Caladenia longicauda was first formally described by John Lindley in 1840 and the description was published in A Sketch of the Vegetation of the Swan River Colony.

[2] The rigid white spider orchid mainly occurs between Ravensthorpe and Israelite Bay in the Coolgardie, Esperance Plains and Mallee biogeographic regions where it grows in moist places including in shallow soil on granite outcrops.