Moorland Clouded Yellow
- Name also: Palaeno Sulphur, Pale Arctic Clouded Yellow
- Family: Whites and Yellows – Pieridae
- Subfamily: Sulphurs – Coliadinae
- Wing span: Medium-sized, 43–54 mm (1.69–2.13 in.).
- Wing upper side: Male pale yellow, female white. Outer margins black on both genders. Forewing with black central blotch. Hind wing with unclear white central blotch.
- Wing underside: Male forewing yellow, female white, both genders with blackish yellow edges and black central blotch. Hind wing dirty yellow, with small white central blotch. Reddish short hairs stand out as a thin stripe on the wing margin if the wings are not worn out.
- Habitat: Mostly bogs and surrounding areas, roadsides with an abundance of flora and logging areas, fell slopes.
- Flying time: Mid-June–late July.
- Overwintering form: Caterpillar.
- Larval foodplant: Bog bilberry (Vaccinium uliginosum), also bilberry (Vaccinium myrtillus) possible.
Like its close relatives, the moorland clouded yellow holds its wings against each other when it is resting, so the upper wing surface is difficult to study without catching the butterfly first. The moorland clouded yellow can be differentiated from other yellow and white sulphurs by the coherent black border that runs around the upper side of both its hind wings and forewings. The underside of both the hind wings and forewings lack the black dots that border the wings. Unlike other sulphurs, the blotch on the underside of its hind wings lacks a red border.
The moorland clouded yellow is quite common all over Finland on bogland habitats. Females lay their eggs one by one on the leaves of the host plant.