Lungwort lichen is a variety of lichen, a symbiotic organism composed of members of two or more kingdoms. Typically, a lichen consists of a fungus primarily and another organism able to generate food via photosynthesis.

Lungwort is a foliose lichen, meaning it has a leafy appearance. Because it grows on the bark of trees found in old growth forests and woodlands throughout North America, Europe, Asia and Africa, it is also known as Tree Lungwort, Oak Lung and Lung Moss. The “lung” reference is readily appreciated when viewing a specimen in its natural habitat because it’s branching leaves and overall shape resemble a pair of lungs and bronchi.

The dried herb is used to make teas, liquid extracts, infusions and syrups.