Synonyms: Dimelaena biziana, Physcia ragusana, Squamaria biziana.
Common name: frosted rosette.
Physcia biziana is a foliose lichen species characterized by its gray to gray-brown thallus with rounded lobes, typically 1-3 mm wide. It has a medulla that reacts K+ yellow and contains the secondary metabolite zeorin. In East and Central Texas, Physcia biziana is commonly found on trees, particularly oak and cedar, as well as on rocks and fence posts, in areas with full sun to partial shade. It tends to thrive in regions with moderate to high humidity and can be abundant in urban and rural environments.
Frosted rosette lichen (Physcia biziana) on oak bark in open area in cemetery at Mission de Cristo Jesus Church at road 259 in Port Sullivan, west from Hearne. Texas, January 8, 2019
1769 Co Rd 259, Cameron, TX 76520, USA
Frosted rosette lichen (Physcia biziana) with pruina on an oak in open area in cemetery at Mission de Cristo Jesus Church at road 259 in Port Sullivan, west from Hearne. Texas, January 8, 20191769 Co Rd 259, Cameron, TX 76520, USA
Frosted rosette lichen (Physcia biziana) on a brick shrine in cemetery at Mission de Cristo Jesus Church at road 259 in Port Sullivan, west from Hearne. Texas, January 8, 20191769 Co Rd 259, Cameron, TX 76520, USA
Frosted rosette lichen (Physcia biziana) on a brick surface in cemetery at Mission de Cristo Jesus Church at road 259 in Port Sullivan, west from Hearne. Texas, January 8, 20191769 Co Rd 259, Cameron, TX 76520, USA
Frosted rosette lichen (Physcia biziana) on tomb in cemetery at Mission de Cristo Jesus Church at road 259 in Port Sullivan, west from Hearne. Texas, January 8, 20191769 Co Rd 259, Cameron, TX 76520, USAObservations of Physcia biziana in East and Central Texas reveal its presence on various substrates. The lichen was found growing on oak bark in open areas, such as a cemetery in Port Sullivan, where it was observed with pruina on an oak tree. It also thrived on non-organic surfaces, including brick shrines and tombstones, indicating its ability to colonize different materials. The species' adaptability is further demonstrated by its growth on both vertical and horizontal surfaces, suggesting a wide range of tolerance for environmental conditions. All observations were made in the same location, a cemetery at Mission de Cristo Jesus Church, on January 8, 2019, highlighting the lichen's localized abundance in this area. The species' presence was consistently noted in open areas, implying a preference for exposed environments.
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