Synonyms: Biatora coroniformis, Biatora crenata, Endocarpon crenatum, Lecidea coroniformis, Lecidea crenata, Lecidea elegans, Phyllopsora coroniformis, Psora concava, Psora coroniformis, Psora elegans.
Common name: brick scale.
Psora crenata is a crustose lichen that forms small, circular patches on rocks and soil. In East and Central Texas, it typically grows on calcareous substrates, such as limestone and dolostone, in open areas with full sun to partial shade. The thallus is grayish-white to beige, often with a wavy or crenate margin, and produces numerous apothecia with brown to dark brown discs. It is relatively common in the region, particularly in areas with shallow soil and rocky outcrops.
Brick scale lichen (Psora crenata) on shallow soil covering limestone on Moore's Hill Outcrop at FM Road 3090 near Navasota. Texas, February 2, 2019
FM 3090, Navasota, TX 77868, USAObservations of Psora crenata in East and Central Texas reveal its presence on shallow soil covering limestone outcrops. On February 2, 2019, the species was found on Moore's Hill Outcrop at FM Road 3090 near Navasota, where it formed a dense crust on the soil surface. The lichen's thalli were noted to be small and rounded, with a distinctive crenate margin. Further observations in the region have confirmed that Psora crenata tends to thrive in areas with low vegetation cover and high levels of sunlight, often growing in association with other lichens and mosses. Its distribution appears to be tied to the presence of limestone outcrops, which provide a suitable substrate for growth. Overall, Psora crenata is a common component of the lichen flora in East and Central Texas, particularly in areas with shallow soil and rocky outcrops.
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