Synonyms: Biatora rufonigra, Lecidea brouardii, Lecidea rufonigra, Psora rufonigra.
Common name: Blue-edged Scale Lichen.
Psorula rufonigra is a crustose lichen species characterized by its reddish-brown to blackish apothecia and white to grayish thallus. In East and Central Texas, it typically grows on calcareous rocks, outcrops, and tree bark, often in open woodlands and rocky hillsides. The lichen's distribution in this region is scattered, with records from counties including Travis, Williamson, and Bastrop, where it can be found in areas with low to moderate elevation and full sun to partial shade.
Blue-edged scale lichen (Psorula rufonigra) in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
Unnamed Road, Llano, TX 78643, USA
Blue-edged scale lichen (Psorula rufonigra) (olivaceous) in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018Unnamed Road, Llano, TX 78643, USA
Blue-edged scale lichen (Psorula rufonigra) (olivaceous) on a filamentous cyanolichen Spilonema revertens (black) in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018Unnamed Road, Llano, TX 78643, USA
Blue-edged scale lichen (Psorula rufonigra) on Freshman Mountain in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018Unnamed Road, Llano, TX 78643, USAObservations of Psorula rufonigra in East and Central Texas reveal its presence in the Enchanted Rock State Natural Area, specifically on granitic outcrops. The lichen exhibits varying colors, including a typical blue-edged scale appearance and an olivaceous hue. It has been found growing alone, as well as in association with other species, such as the filamentous cyanolichen Spilonema revertens. Notably, Psorula rufonigra has been observed on different substrates within the area, including rocks on Freshman Mountain and other outcrops. The observations were made on December 25, 2018, in Fredericksburg, Texas, highlighting the species' occurrence in this region during the winter season. These findings contribute to a better understanding of Psorula rufonigra's distribution and ecology in East and Central Texas. Multiple sightings in the same area suggest it may be relatively common in the region.
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