Common names: granite rosette lichen, Hale's Rosette Lichen.
Physcia halei is a crustose to foliose lichen species characterized by its grayish-white to pale gray thallus, with lobes 1-3 mm wide, and apothecia that are 0.5-2 mm in diameter. In East and Central Texas, it grows on trees, particularly oak and elm, as well as on rocks and soil. It is commonly found in open woods, savannas, and along roadsides, preferring full sun to partial shade and well-drained substrates. The species is relatively common in the region, with a wide distribution across the eastern and central parts of the state.
Mexican yolk lichen (Candelina submexicana) together with granite rosette lichen (Physcia halei) at the edge of a granite stone in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
Unnamed Road, Llano, TX 78643, USA
Narrow lobes of granite rosette lichen (Physcia halei) in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018Unnamed Road, Llano, TX 78643, USAObservations of Physcia halei in East and Central Texas reveal its growth habits and associations with other species. In Enchanted Rock State Natural Area, Fredericksburg, Texas, it was found growing alongside Mexican yolk lichen (Candelina submexicana) on the edge of a granite stone. The granite rosette lichen displayed narrow lobes, characteristic of its morphology. This sighting suggests that Physcia halei thrives in areas with suitable substrate, such as granite, and can coexist with other lichen species. The narrow lobes of the lichen were also observed, providing insight into its physical characteristics. These observations contribute to a better understanding of the ecology and distribution of Physcia halei in East and Central Texas, highlighting its affinity for specific environments and potential interactions with other lichens. Further study could explore its range and abundance in the region.
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