Synonyms: Parmelia albinea, Parmelia dimidiata, Parmelia pulverulenta, Physcia aipolia, Physcia albinea, Physcia stellaris.
Common name: exuberant rosette.
Physcia dimidiata is a foliose lichen species characterized by its gray to gray-brown thallus with rounded lobes, typically 2-5 mm wide. It has a moderately developed lower cortex and a pale yellow to yellow-brown medulla. In East and Central Texas, Physcia dimidiata is commonly found on trees, particularly oak and cedar, as well as on rock outcrops and fence posts, often in areas with full sun to partial shade. It thrives in the region's temperate climate with moderate humidity and can be identified by its distinctive thallus morphology and secondary chemistry, which includes atranorin and zeorin.
Rosette lichen Physcia dimidiata(?) on a marble tomb in Ebenezer Cemetery near Huntsville, Texas, February 17, 2019
SH 30, Huntsville, TX 77340, USA
Rosette lichen Physcia dimidiata(?) on a marble angel in City Cemetery. Bryan, Texas, March 3, 20191201 Pear St, Bryan, TX 77803, USA
Rosette lichen Physcia dimidiata(?) on a leg of a marble angel in City Cemetery. Bryan, Texas, March 3, 20191201 Pear St, Bryan, TX 77803, USAObservations of Physcia dimidiata in East and Central Texas reveal its presence on various substrates, particularly marble tombstones and statues. On February 17, 2019, the lichen was found on a marble tomb in Ebenezer Cemetery near Huntsville, Texas. In Bryan, Texas, it was observed on a marble angel in City Cemetery on March 3, 2019, with another sighting on the leg of a different marble angel in the same cemetery on the same day. These observations suggest that Physcia dimidiata is able to thrive on calcareous surfaces, such as marble, in this region. The lichen's rosette shape was noted in each observation, indicating its distinctive morphology. These findings contribute to our understanding of the species' distribution and substrate preferences in East and Central Texas.
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