This species was described by Alfred Philpott in 1928 using specimens collected by Jean Lindsay at "Blackmillar" (Black Miller Stream), Kaikōura and named Crytopechia lindsayae.

[4] In 1988 John S. Dugdale reinstated the genus Phaeosaces and assigned P. lindsayae to it.

Palpi ochreous grey mixed with blackish, terminal segment black externally, except at apex.

Forewings moderate, costa well arched basally, apex rounded, termen oblique; ochreous grey, densely irrorated with dark fuscous, the irroration tending to form costal spots and interrupted transverse strigae; stigmata obscurely indicated, pical beneath first discal, second discal rather large, transverse; veins faintly outlined in fuscous towards termen; a blackish terminal line; fringes ochreous, sprinkled with fuscous.

[2][4] This species has been classified as having the "Data Deficient" conservation status under the New Zealand Threat Classification System.