Bitter pore lichen
| Bitter pore lichen | ||||||||||||
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Bitter lichen ( Pertusaria amara ) |
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| Pertusaria amara | ||||||||||||
| ( Oh. ) Nyl. |
The bitter pore lichen ( Pertusaria amara ), also called bitter lichen , is a relatively common but inconspicuous crusty lichen that grows on the bark of trees. The name suggests the very bitter taste of this lichen. It contains the active ingredient picrolichenin , which was used against intermittent fever .
Occurrence
The bitter pore lichen lives in humid, non- eutrophic locations. Lichen is now declining significantly in areas that are heavily polluted and used for agriculture. It grows on conifers as well as on deciduous trees with slightly acidic bark . It is also found on street trees such as maple , ash , linden and fruit trees such as apple and pear . In forests it prefers to grow on beeches and oaks .
features
The bumpy to cartilaginous beds of the bitter pore lichen are gray and form arched, whitish-gray sorals between 0.5 and 1.5 cm in diameter . In the young state, individual, clearly defined, hemispherical, arched sorals can be seen, which can flow together with increasing age of the lichen and in places form a thick, even cushion. Fruit bodies ( apothecia ) are only very rarely formed.
literature
- Volkmar Wirth , Ruprecht Düll : Color Atlas of Lichen and Moss. Ulmer, Stuttgart 2000, ISBN 3-8001-3517-5 .
