Common name: slender rosette lichen.
Physcia subtilis is a crustose to foliose lichen species characterized by its pale gray to white thallus, often with a subtle bluish tint, and numerous apothecia. In East and Central Texas, it typically grows on trees, particularly oak and cedar, as well as on rocks and soil. The species is relatively small, with lobes 0.5-2 mm wide, and has a fragile, brittle texture. It can be found in a variety of habitats, including woodlands, savannas, and urban areas, often in full sun to partial shade.
Slender rosette lichen (Physcia subtilis) on a granite surface in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
Unnamed Road, Llano, TX 78643, USAObservations of Physcia subtilis in East and Central Texas reveal its presence on various substrates. On a granite surface at Enchanted Rock State Natural Area in Fredericksburg, Texas, the lichen formed slender rosettes, as seen on December 25, 2018. In other areas, it was found growing on trees, such as oak and cedar, and on rocks, including limestone and sandstone. The lichen's thallus was typically pale gray to white, with lobes that were narrow and pointed. Apothecia were present, ranging in color from brown to dark red. Physcia subtilis was often found in areas with full sun to partial shade, and its growth habits varied depending on the substrate and environmental conditions. Its distribution appeared to be widespread in East and Central Texas, with sightings reported in multiple counties across the region. The lichen's adaptability to different environments was notable.
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