Synonyms: Anaptychia applanata, Dirinaria consimilis, Lecanora flavostraminea, Parmelia applanata, Parmelia redacta, Physcia applanata, Physcia flavostramineum, Placodium flavostramineum.
Common names: powdery medallion lichen, Dirinaria Lichen.
Dirinaria applanata is a crustose lichen that forms yellow to orange-yellow patches on bark and rock surfaces. In East and Central Texas, it is commonly found on trees such as oak, elm, and cedar, as well as on limestone and sandstone rocks. The thallus is smooth and flat, often with distinct marginal ridges, and contains anthraquinone pigments that give it a bright yellow-orange color. Apothecia are immersed to slightly raised, with a dark brown to black disc and a yellow-orange margin. This species is widely distributed in the region, particularly in areas with high humidity and moderate to full shade.
Powdery medallion lichen (Dirinaria applanata)(?) on a tombstone made from petrified wood in Odd Fellow Cemetery. Anderson, Texas, December 31, 2018
1667 FM 149, Anderson, TX 77830, USA
Powdery medallion lichen (Dirinaria applanata)(?) on a petrified wood tomstone in Odd Fellow Cemetery. Anderson, Texas, December 31, 20181667 FM 149, Anderson, TX 77830, USA
Powdery medallion lichen (Dirinaria applanata) on bark of a crape myrtle tree in Odd Fellow Cemetery. Anderson, Texas, December 31, 20181667 FM 149, Anderson, TX 77830, USA
Pattern of powdery medallion lichen (Dirinaria applanata) on bark of a crape myrtle tree in Odd Fellow Cemetery. Anderson, Texas, December 31, 20181667 FM 149, Anderson, TX 77830, USA
Powdery medallion lichen (Dirinaria applanata) on low tombstone in Odd Fellow Cemetery. Anderson, Texas, December 31, 20181667 FM 149, Anderson, TX 77830, USA
Powdery medallion lichen (Dirinaria applanata) on bark of a tree in Odd Fellow Cemetery. Anderson, Texas, December 31, 20181667 FM 149, Anderson, TX 77830, USA
Powdery medallion lichen (Dirinaria applanata) on an oak in cemetery at Mission de Cristo Jesus Church at road 259 in Port Sullivan, west from Hearne. Texas, January 8, 20191769 Co Rd 259, Cameron, TX 76520, USA
Powdery medallion lichen (Dirinaria applanata) on a tombstone in cemetery at Mission de Cristo Jesus Church at road 259 in Port Sullivan, west from Hearne. Texas, January 8, 20191769 Co Rd 259, Cameron, TX 76520, USA
Powdery medallion lichen (Dirinaria applanata) on a tomb in cemetery at Mission de Cristo Jesus Church at road 259 in Port Sullivan, west from Hearne. Texas, January 8, 20191769 Co Rd 259, Cameron, TX 76520, USA
Powdery medallion lichen (Dirinaria applanata) on a cemented brick in cemetery at Mission de Cristo Jesus Church at road 259 in Port Sullivan, west from Hearne. Texas, January 8, 20191769 Co Rd 259, Cameron, TX 76520, USA
Powdery medallion lichen (Dirinaria applanata) in Lick Creek Park. College Station, Texas, January 9, 2019Raccoon Run, College Station, TX 77845, USA
Powdery medallion lichen (Dirinaria applanata) on a small hackberry tree in Lick Creek Park. College Station, Texas, January 9, 2019Raccoon Run, College Station, TX 77845, USA
Powdery medallion lichen (Dirinaria applanata) in Lick Creek Park. College Station, Texas, January 18, 2019
Powdery medallion lichen (Dirinaria applanata) on a tree in Lick Creek Park. College Station, Texas, January 18, 2019
Powdery medallion lichen (Dirinaria applanata)(?) in Lick Creek Park. College Station, Texas, January 18, 2019
Powdery medallion lichen (Dirinaria applanata) on yaupon holly in Lick Creek Park. College Station, Texas, January 18, 2019
Powdery medallion lichen (Dirinaria applanata)(?) on yaupon holly in Lick Creek Park. College Station, Texas, January 18, 2019
Powdery medallion lichen (Dirinaria applanata)(?) in Lick Creek Park. College Station, Texas, January 18, 2019
Close up of powdery medallion lichen (Dirinaria applanata)(?) on yaupon holly in Lick Creek Park. College Station, Texas, January 18, 2019
Powdery medallion lichen (Dirinaria applanata)(?) on a tree in Lick Creek Park. College Station, Texas, January 18, 2019
Powdery medallion lichen (Dirinaria applanata) in Lick Creek Park. College Station, Texas, January 18, 2019
Powdery medallion lichen (Dirinaria applanata)(?) in Lick Creek Park. College Station, Texas, January 18, 2019
Powdery medallion lichen (Dirinaria applanata) in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 23, 201923292 FM 1155, Washington, TX 77880, USA
Lichen Dirinaria applanata or may be Physcia on smooth bark of hackberry tree at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
Rosette lichen Dirinaria applanata or may be Physcia on smooth bark of hackberry tree at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
Powdery medallion lichen (Dirinaria applanata) on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville. Texas, January 26, 2019Lone Star Hiking Trail, Montgomery, TX 77356, USA
Powdery medallion lichen (Dirinaria applanata), to the left, and other foliose lichen on lower branches of old acacia (huisache) between Signature Park 11 apartments and Oil Well near Park Hudson Trail. Bryan, Texas, January 27, 2019Park Hudson Trail, Bryan, TX 77802, USA
Powdery medallion lichen (Dirinaria applanata) on a tree on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, April 24, 2021Lone Star Hiking Trail, Montgomery, TX 77356, USA
Crustose lichen Dirinaria applanata(?) on a wooden pole in Research Park on campus of Texas A and M University. College Station, Texas, May 6, 2022Technology Loop, College Station, Brazos County, Texas, 77845, United States
Close-up of crustose lichen Dirinaria applanata(?) on a wooden pole in Research Park on campus of Texas A and M University. College Station, Texas, May 6, 2022Technology Loop, College Station, Brazos County, Texas, 77845, United StatesThe species of lichen Dirinaria applanata was observed in East and Central Texas from December 2018 to May 2022. The majority of observations were made in Anderson, College Station, and surrounding areas. The lichen was found growing on various substrates including tombstones, tree bark (crape myrtle, oak, hackberry, yaupon holly, and acacia), cemented bricks, and wooden poles. Observations were recorded in cemeteries, parks (Lick Creek Park, Washington-on-the-Brazos State Historic Site, and Sam Houston National Forest), and on hiking trails (Lone Star Hiking Trail). Some observations were uncertain, with question marks indicating potential misidentification. The lichen was often described as "powdery medallion lichen" and was sometimes found alongside other foliose or crustose lichens. Overall, the observations suggest that Dirinaria applanata is widespread in East and Central Texas, growing on a variety of surfaces.
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