Punctelia subrudecta

Punctelia subrudecta is a foliose lichen that is recognizable by the tiny white spots on its thallus. These pale spots, known as pseudocyphellae, help distinguish it from other similar-looking lichens. It typically grows in a pale grayish-green, leafy formation.

This lichen is typically found colonizing tree bark in temperate forests of North America. It thrives on the bark of various deciduous trees where it can receive adequate sunlight and moisture. It is a common sight in healthy woodland ecosystems.

No, like most lichens, Punctelia subrudecta is an epiphyte and does not parasitize or harm the tree. It simply uses the bark as a structural surface to anchor itself while gathering moisture and nutrients from the air. It is a sign of good air quality.

The thallus features a leafy, foliose texture that adheres loosely to the tree bark. The presence of the tiny white spots, or pseudocyphellae, gives the surface a slightly porous appearance. It can often form large, overlapping colonies across the bark.