Synonyms: Imbricaria rudecta, Parmelia borreri, Parmelia rudecta.
Common name: rough speckled shield lichen.
Punctelia rudecta is a foliose lichen species characterized by its pale green to grayish-green thallus with rounded lobes, typically 2-5 mm wide. It has numerous point-like pseudocyphellae on the upper surface and a lower surface with a thick, white medulla. In East and Central Texas, Punctelia rudecta is commonly found growing on trees, particularly oak and cedar, in open woods and along roadsides. It thrives in areas with full sun to partial shade and can tolerate a range of soil types. The lichen is widely distributed across the region, with frequent sightings in counties including Travis, Bastrop, and Williamson.
Rough speckled shield lichen (Punctelia rudecta) on a fallen oak at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
117 Parkview Dr, Somerville, TX 77879, USA
Rough speckled shield lichen (Punctelia rudecta) on sandstone in an oak and red cedar forest at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019Lake Somerville Trailway, Somerville, TX 77879, USA
Rough speckled shield lichen (Punctelia rudecta) on a tree in Lick Creek Park. College Station, Texas, February 3, 2019Post Oak Trail, College Station, TX 77845, USA
Rough speckled shield lichen (Punctelia rudecta) on a tree in Lick Creek Park. College Station, Texas, February 3, 2019Iron Bridge Trail, College Station, TX 77845, USA
Rough speckled shield lichen (Punctelia rudecta) on tree bark in Lick Creek Park. College Station, Texas, February 3, 201914802 Rock Prairie Rd, College Station, TX 77845, USA
Rough speckled shield lichen (Punctelia rudecta) on yaupon holly or may be on oak in Lick Creek Park. College Station, Texas, February 3, 2019Raccoon Run, College Station, TX 77845, USA
Rough speckled shield lichen (Punctelia rudecta) on a tree on Alligator Branch section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville. Texas, February 17, 2019Lone Star Hiking Trail, Huntsville, TX 77340, USA
Rough speckled shield lichen (Punctelia rudecta) on a tree in Lick Creek Park. College Station, Texas, February 20, 2019Iron Bridge Trail, College Station, TX 77845, USA
Rough speckled shield lichen (Punctelia rudecta) on a tree on Lone Star Hiking Trail near Pole Creek in Sam Houston National Forest. Richards, Texas, March 1, 2019Lone Star Hiking Trail, Montgomery, TX 77356, USA
Rough speckled shield lichen (Punctelia rudecta) on a tree on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest near Huntsville. Texas, March 2, 2019Little Lake Creek Loop Trail, Montgomery, TX 77356, USA
Rough speckled shield lichen (Punctelia rudecta) on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest near Huntsville. Texas, March 2, 2019Little Lake Creek Loop Trail, Montgomery, TX 77356, USAIn East and Central Texas, Punctelia rudecta was observed growing on various substrates, including fallen oak, sandstone, tree bark, and yaupon holly or oak. The lichen was found in multiple locations, such as Lake Somerville Trailway, Lick Creek Park, Sam Houston National Forest, and Lone Star Hiking Trail. Observations were made between January 25 and March 2, 2019. The species was commonly seen on trees, including oak and possibly yaupon holly, and was also found on sandstone in an oak and red cedar forest. Multiple sightings were recorded in Lick Creek Park and Sam Houston National Forest, indicating a relatively widespread presence of Punctelia rudecta in these areas. The lichen's growth on different substrates suggests adaptability to various environments.
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