The population of Lobaria pulmonaria (tree lungwort) has been regarded as a relict on the Åland Islands (Ahvenanmaa). Fresh findings of apothecia imply the opposite. Censusing of 13 localities with more than 200 trees has shown that the lichen predominantly grows along the NW—NE sector of tree trunks with porous bark in easterly slopes. In light and dry wooded meadows the lichen has a lower vitality than in undisturbed, shady and moist forests. Most thalli occurred on Acer platanoides, Fraxinus excelsior and Populus tremula, even though Quercus robur, Tilia cordata and some other species were also represented. About half of the trees were found in Höckböle and it was also there and at Ingersholma that we found apothecia.