Lecanora argentata
| Lecanora argentata | ||||||||||||
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Lecanora argentata (center) and Xanthoria parietina (left and above) |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Lecanora argentata | ||||||||||||
| ( Oh. ) Malme |
Lecanora argentata is a type of crusty lichen . It is characterized by its gray-white color, regularly shaped, dark brown to dark red-brown apothecaries and an existing storage edge .
features
The camp is whitish to greenish white in color. At the edge it is smooth, towards the middle it becomes uneven to warty. It has no soredia . Sometimes there is a black template. The apothecia reach a diameter between 0.4 and 0.9 millimeters and are relatively close together. The disc is dark brown-reddish to dark brown in color and unripened. The edge is often thick, not or only slightly notched and durable.
The top layer of the apothecia (epihymenium) contains small crystals that do not light up in polarized light . The red-brown color is retained even after a reaction with potassium hydroxide (KOH). The crystals in the edge of the apothecia, however, glow in polarized light; they are large and insoluble in KOH. The spores are unicellular and measure 12 to 15 by 6 to 9 micrometers. The bearing reacts clearly yellow with KOH and yellowish with phenylenediamine .
ecology
Lecanora argentata occurs mainly on maples , ash trees and poplars . It has a medium toxicity tolerance to air pollution.
Species delimitation
Lecanora argentata can be confused with some other species of the genus, which are very difficult to differentiate. Lecanora allophana often has wavy, bent, mostly clearly irregularly notched edges of the apothecia with small teeth or lobules. However, it can only be distinguished with certainty by small crystals in the apothecary margin. L. subrugosa only differs in its strongly notched margins and is therefore sometimes indistinguishable . L. chlarotera and L. rugosella have small crystals in the epihymenium that light up in polarized light and disappear after the addition of KOH. The apothecary disc of these lichens is usually light to dirty brown in color. L. pulicaris is also similar, but its apothecary edge reacts red with phenylenediamine .
literature
- U. Kirschbaum, V. Wirth: recognize lichen. Determine air quality. Ulmer, Stuttgart 1995, ISBN 3-8001-3477-2 .
