Leptidea morsei (Fenton's wood white) is a butterfly of the family Pieridae. It is found from central Europe to Siberia, Ussuri, Korea, northern China and Japan.
The wingspan is 46âÂÂ54 mm. The wing ground color is white. The forewings are falcate- elongated at the apex and with a concave outer margin. The male forewing has a dark spot at the apex. In spring-generation butterflies, the hindwing base color is grayish-ochre on the underside, while in summer-generation individuals, it is white..Adults are on wing from April to May and again from June to July in two generations per year.
The larvae feed on legumes, including Lathyrus niger, Lathyrus hallersteinii and Lathyrus vernus in Europe. Other recorded food plants include Vicia cracca, Vicia japonica and Vicia amoena. Hibernation takes place in the pupal stage.
Julius Rober in Seitz considered it to be "apparently an aberration of Leptidea amurensis in which the subapical spot of the forewing above is less developed.