Slender orange-bush lichen (Teloschistes exilis) on a twig of elm when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from a trailway near Birch Creek Unit of Somerville Lake State Park. Texas

🎞️ #3610-05

The image depicts two photographs of a lichen on an elm twig. The top photograph shows the lichen under normal daylight conditions, with the coloration appearing to be a mixture of green and yellow hues. The bottom photograph shows the same lichen illuminated by a 365 nm ultraviolet (UV-A) blacklight.

**Image Details**

* **Photographs**
* Top: The top photograph is taken in natural daylight.
* Bottom: The bottom photograph is taken under illumination from a 365 nm UV-A blacklight.
* **Lichen Coloration**
* Under normal daylight conditions, the lichen appears green and yellow.
* When illuminated by a 365 nm UV-A blacklight, the lichen turns orange.

**Conclusion**

The image demonstrates how certain organisms can fluoresce or change color under different lighting conditions. The use of UV-A light to illuminate the lichen reveals its true colors, which are not visible in normal daylight. This phenomenon is likely due to the presence of fluorescent pigments within the lichen's cells that absorb and re-emit light at specific wavelengths. – AI vision

🇪🇸 Descripción en español / Spanish Description

El líquen delgado arbustivo naranja (Teloschistes exilis) en una ramita de olmo cuando se expone a la luz diurna regular, así como también cuando es iluminado por una luz negra ultravioleta de 365 nm (UV-A) desde un camino cerca de Birch Creek Unit de Somerville Lake State Park. Texas, 28 de agosto de 2024. La imagen muestra dos fotografías de un líquen en una ramita de olmo. La fotografía superior muestra el líquen bajo condiciones normales de luz diurna, con la coloración que parece ser una mezcla de tonos verdes y amarillos. La fotografía inferior muestra el mismo líquen iluminado por una luz negra ultravioleta de 365 nm (UV-A). **Detalles de la imagen** * **Fotografías** * Superior: La fotografía superior se toma en luz natural diurna. * Inferior: La fotografía inferior se toma bajo iluminación de una luz negra ultravioleta de 365 nm. * **Coloración del líquen** * Bajo condiciones normales de luz diurna, el líquen aparece verde y amarillo. * Cuando es iluminado por una luz negra ultravioleta de 365 nm, el líquen se vuelve naranja. **Conclusión** La imagen demuestra cómo ciertos organismos pueden fluorescer o cambiar de color bajo diferentes condiciones de iluminación. El uso de luz UV-A para iluminar el líquen revela sus verdaderos colores, que no son visibles en la luz diurna normal. Este fenómeno se debe probablemente a la presencia de pigmentos fluorescentes dentro de las células del líquen que absorben y reemiten luz a longitudes de onda específicas. – Spanish translation

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