The expected results of standard chemical spot tests for the lichen are: thallus K+ (deep yellow), KC+ (yellow), C−, P− (or weakly yellowish); the soredial mass tests K+ (yellow), KC+ (yellow), C−, ...
two subspecies: Eupithecia subfuscata subfuscata Eupithecia subfuscata ussuriensis Dietze 1910 (Russian Far East, Japan) The forewings of this species are ...