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Placidium squamulosum
I found several colonies scattered mostly near or under the vegetation. This lichen grows on soil and I believe it needs soil with a high (or certain) lime content. Though it is brown here on a warm 85-degree day during a dry spell it can vary from almost black to green when moist.
Found on the soil along a trail at Falcon Lake State Park. The habitat is thorn brush in the Tamaulipan bushland along the Rio Grande.
There might be a plant association that I'm still researching.
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