| As elevation increases, trees become stunted and above the treeline only shrubs, moss, lichen and herbs are found. |
| In the interim, Veikko, with the help of only lichen and cold water, has ingeniously made his escape from his Promethean securement. |
| On our moss-covered trails, mats of shrubby gray reindeer lichen and Iceland lichen are common. |
| Because of their sedentary character and free grazing habit, reindeer tend to trample and overgraze lichen pastures during summer and autumn. |
| In 1980, an old ash tree in Cumbria on which this lichen grew, had to be felled for safety reasons. |
| The fungus and alga of the lichen enjoy the symbiotic relationship of mutualism, each giving the other something that is required. |
