Synonym: Lecidea isidiotyla.
Phyllopsora isidiotyla is a crustose lichen species characterized by a pale yellowish-green to greenish-gray thallus, often with numerous isidia. In East and Central Texas, it typically grows on trees, particularly oak and cedar, in shaded to partially shaded areas. The thallus is usually 1-5 cm in diameter, with a rough, wart-like surface and abundant cylindrical isidia that are 0.1-0.5 mm tall. Apothecia are rare, but when present, they are immersed to slightly raised, with a pale yellowish to brownish disk. This species is relatively common in the region, particularly in areas with high humidity and moderate temperatures.
Lichen Phyllopsora isidiotyla on a tree on Lone Star Hiking Trail near Pole Creek in Sam Houston National Forest. Richards, Texas, February 9, 2019
Lone Star Hiking Trail, Montgomery, TX 77356, USAThe species Phyllopsora isidiotyla was observed growing on a tree along the Lone Star Hiking Trail near Pole Creek in Sam Houston National Forest, Richards, Texas, on February 9, 2019. The lichen was found to be thriving in the forest's humid environment, with its yellow-green thallus and numerous isidia visible on the tree bark. Further observations in East and Central Texas revealed that Phyllopsora isidiotyla tends to prefer shaded, moist areas with moderate to high humidity, often growing on deciduous trees such as oak and maple. The lichen's distribution appears to be scattered throughout the region, with sightings reported in several counties, including Montgomery, Walker, and Grimes. Overall, the observations suggest that Phyllopsora isidiotyla is a relatively common species in East and Central Texas, particularly in areas with suitable habitat conditions. Its presence can be an indicator of forest health and ecosystem balance.
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