About Psilolechia lucida (Ach.) M.Choisy
Psilolechia lucida (Ach.) M.Choisy forms a sulphur-yellow to yellowish green crust; its colour becomes greener when the surface is wet. The crust is made of powdery soredia, which can be thin or thick, and is sometimes divided into irregular areoles. Its apothecia are typically less than 0.3 mm in diameter, are yellow in colour, range in shape from hemispherical to irregular and lumpy, and do not have margins. Each ascus contains eight ascospores, which measure 4–7 by 1–2.5 μm.
This widespread species is found across the globe. It is common and widely distributed in Europe. In Asia, it has been reported from Japan; in the Middle East, it occurs in Turkey; in Africa, it is known from the Canary Islands and Madeira. In South America, it has only been reported from Bolivia and Chile. It has also been found in Oceania, Central America, and the Antarctic Peninsula. It grows on both calcareous and siliceous rocks, as well as artificial rocky substrates such as bricks and concrete. This lichen grows in shaded locations, and is often found in sheltered underhangs. Rarely, it can be found growing on hardwood tree bark, at the base of trees or on above-ground tree roots.
