Physcia adscendens
| Physcia adscendens | ||||||||||||
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Physcia adscendens (in the lower area the common yellow lichen ) |
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| Scientific name | ||||||||||||
| Physcia adscendens | ||||||||||||
| ( Fr. ) H. Olivier |
Physcia adscendens (sometimes also referred to as helmet callus lichen ) is a type of leaf lichen that is common in Central Europe. The specific epithet adscendens comes from the Latin word adscendere = ascend and refers to the ascending helmet-like rag ends.
description
Physcia adscendens initially grows in small rosettes, which later often flow together like a lawn. The lobules of the thallus are ash gray to white and 0.5 to 1 mm wide. At the end of the lobule there are characteristic, dome-like to helmet-like bulges with sores on the underside, where vegetative distribution units ( soredia ) are formed. These so-called “Helmsorale” distinguish them from the very similar Physcia tenella , with which they are often associated. It has whitish fibrils on the edge. Fruit bodies ( apothecia ) are only rarely formed.
distribution
Physcia adscendens is widespread and occurs primarily on the nutrient-rich bark of deciduous trees, and occasionally on calcareous rock. Due to its relative insensitivity to air pollutants, it is also often found in large cities.
literature
- Volkmar Wirth: Lichen flora . E. Ulmer, Stuttgart 1980, ISBN 3-8001-2452-1
- Bruno P. Kremer, Hermann Muhle: Flechten, Moose, Farne , Mosaik Verl., Munich 1991, ISBN 3-570-06652-5
- Volkmar Wirth, Ruprecht Düll : Color Atlas of Lichen and Moss. Ulmer, Stuttgart 2000, ISBN 3-8001-3517-5 .
