The type specimen of Micarea viridileprosa was collected in France, Finistère, near Douarnenez at Pointe du Millier, Moulin de Keriolet, in a sheltered valley on mature Castanea sativa.

[3] The thallus of Micarea viridileprosa is crustose, composed of bright greenish goniocysts (vegetative propagules), which can coalesce to form larger granules.

The lichen's growth often gives the appearance of irregular "soralia", producing powdery "soredia" which can cover the entire thallus.

[2] Micarea viridileprosa is found in various habitats, including on the bark of trees such as Betula, Alnus glutinosa, Pinus sylvestris, Prunus padus, and Quercus robur.

The species is widespread in the Netherlands and Belgium and has been recorded in England, Wales, France, Germany, Italy, Portugal, and Switzerland.