Powdery medallion lichen (Dirinaria applanata) in Lick Creek ParkLick Creek: Background Notes. College Station, Texas

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College Station - Pedernales Falls, Texas, January 9 - 11, 2019

Album 2428: College Station - Pedernales Falls, Texas, January 9 - 11, 2019

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The image displays a light greenish-gray lichen growing on a rocky surface. It is identified as "Powdery Medallion Lichen" (Dirinaria applanata) by its unique appearance, which resembles medallions or coins due to the rounded shape of its thalli, with overlapping lobes that resemble coin rims.

The lichen appears powdery in color and texture. The surface is covered in small, rounded lobes that are arranged in concentric circles, giving it a distinctive "medallion-like" appearance. The center of each lobe is slightly indented, creating a subtle curvature to the overall shape of the thalli.

The background of the image shows various shades of gray and brown, likely indicating different types of rocks or soil that the lichen has colonized. Some of these surfaces appear smooth and flat, while others are more rugged with visible cracks and crevices.

Overall, the image provides a clear view of the Powdery Medallion Lichen's unique morphology and its ability to grow on diverse substrates. – AI vision

🇪🇸 Descripción en español / Spanish Description

El lichen medallón pulverulento (Dirinaria applanata) en Lick Creek Park. College Station, Texas, 9 de enero de 2019. La imagen muestra un lichen grisáceo claro que crece sobre una superficie rocosa. Se identifica como "Lichen medallón pulverulento" (Dirinaria applanata) por su aspecto único, que recuerda a medallas o monedas debido a la forma redondeada de sus tallos, con lóbulos superpuestos que recuerdan los bordes de las monedas. El lichen tiene un color y textura pulverulentos. La superficie está cubierta por pequeños lóbulos redondos dispuestos en círculos concéntricos, dándole un aspecto distintivo "a modo de medalla". El centro de cada lóbulo tiene una leve hendidura, creando una curvatura sutil en la forma general del tallo. En segundo plano se pueden ver diferentes tonalidades de gris y marrón, que indican diferentes tipos de rocas o suelos colonizados por el lichen. Algunas de estas superficies parecen lisas y planas, mientras que otras son más irregulares con grietas y hendiduras visibles. En general, la imagen proporciona una vista clara de la morfología única del lichen medallón pulverulento y su capacidad para crecer en sustratos diversos. – Spanish translation

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