Foliose lichens Ramalina celastri and 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

🎞️ #3610-02

The image shows two foliose lichens, Ramalina celastri and Teloschistes exilis, on a twig of elm. The top half of the image is taken under normal daylight conditions, while the bottom half is illuminated by a 365 nm ultraviolet (UV-A) blacklight.

**Normal Daylight Conditions**

* The lichens appear as their natural color.
* They have a greenish-yellow hue.
* Ramalina celastri has long, thin branches with small lobes at the end.
* Teloschistes exilis has short, stout branches with rounded tips.

**UV-A Blacklight Illumination**

* The lichens emit an orange glow under UV-A blacklight illumination.
* This is due to the presence of fluorescent pigments in their thallus (the vegetative part of a lichen).
* The coloration is brighter on Ramalina celastri than on Teloschistes exilis.

**Overall Observation**

* The image highlights the unique properties of these two foliose lichens.
* They are able to emit light in response to UV-A radiation, which is a characteristic shared by many organisms that live in environments with high levels of ultraviolet radiation. – AI vision

🇪🇸 Descripción en español / Spanish Description

Los líquenes folióse Ramalina celastri y Teloschistes exilis en una ramita de olmo cuando se expone a la luz diurna regular, así como cuando se ilumina con una luz negra ultravioleta (UV-A) de 365 nm desde un camino cercano a Birch Creek Unidad del Parque Estatal Somerville Lake. Texas, 28 de agosto de 2024. La imagen muestra dos líquenes folióse, Ramalina celastri y Teloschistes exilis, en una ramita de olmo. La mitad superior de la imagen se toma bajo condiciones de luz diurna normal, mientras que la mitad inferior está iluminada con luz negra ultravioleta (UV-A) de 365 nm. **Condiciones Normales de Luz del Día** * Los líquenes aparecen como su color natural. * Tienen un tono verde amarillento. * Ramalina celastri tiene ramas largas y finas con pequeños lóbulos en el extremo. * Teloschistes exilis tiene ramas cortas y robustas con puntas redondeadas. **Iluminación de Luz Negra UV-A** * Los líquenes emiten un brillo naranja bajo iluminación de luz negra UV-A. * Esto se debe a la presencia de pigmentos fluorescentes en su talo (la parte vegetativa de un liquen). * La coloración es más brillante en Ramalina celastri que en Teloschistes exilis. **Observación General** * La imagen destaca las propiedades únicas de estos dos líquenes folióse. * Son capaces de emitir luz en respuesta a la radiación UV-A, lo que es una característica compartida por muchos organismos que viven en entornos con altos niveles de radiación ultravioleta. – Spanish translation

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