Synonyms: Canomaculina subtinctoria, Parmelia protovirens, Parmelia subtinctoria, Parmelia velutina, Parmelia virens, Rimelia subtinctoria, Rimeliella subtinctoria.
Parmotrema subtinctorium is a foliose lichen species characterized by its large, pale green to grayish-green thalli with rounded lobes, typically 2-5 cm in diameter. It has a cortex containing usnic acid and atranorin, and its medulla contains salazinic acid. In East and Central Texas, Parmotrema subtinctorium is commonly found on trees, particularly oak and cedar, in deciduous and mixed forests, often in shaded to partially shaded areas with moderate to high humidity. It thrives in regions with mild winters and hot summers, and can be abundant on trunks and branches of mature trees, forming dense, sprawling colonies.
Observations of Parmotrema subtinctorium in East and Central Texas reveal its presence on various substrates. On a tree in the Big Creek Scenic Area of Sam Houston National Forest, specifically in Shepherd, Texas, this lichen was identified on February 1, 2019. The specimen found was referred to as Ruffle lichen or Canomaculina subtinctoria, which is also known as Parmotrema subtinctorium. This sighting indicates the species' ability to thrive in the region's environmental conditions. Further observations are needed to fully understand its distribution and habitat preferences within East and Central Texas. The discovery of Parmotrema subtinctorium in this area contributes to the understanding of lichen diversity in the region, highlighting the importance of continued exploration and documentation of these organisms. This information can inform conservation efforts and provide insights into the ecological roles of lichens in Texas ecosystems.
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