Synonyms: Acrorixis actinostoma, Aspicilia aperta, Diploschistes calcareus, Diploschistes sbarbaronis, Lagerheimina actinostoma, Lecanora actinostoma, Limboria actinostoma, Thelotrema radiatum, Urceolaria actinostoma, Urceolaria scruposa, Verrucaria actinostoma.
Diploschistes actinostomus is a crustose lichen that grows on soil, rocks, and tree bark. In East and Central Texas, it typically forms small, circular patches with a grayish-white to pale brown thallus and black apothecia. The species prefers well-drained soils and full sun to partial shade, often occurring in open woodlands, prairies, and rocky outcrops. It is relatively common in the region, particularly on limestone and sandstone substrates.
Observations of Diploschistes actinostomus in East and Central Texas reveal its presence on sandstone surfaces, particularly near Lost Pines Overlook in Bastrop State Park. The lichen was found growing alone and in association with other species, such as stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) and Caloplaca. Multiple sightings were recorded on March 14, 2019, and again on October 13, 2019, indicating a consistent presence in the area. The lichen was observed on both vertical and horizontal sandstone surfaces, including benches and outcroppings. Some observations were tentative, marked as Diploschistes actinostomus(?), suggesting potential uncertainty in identification. Overall, the data suggest that Diploschistes actinostomus is a component of the lichen community in this region of Texas.
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