Synonyms: Hypogymnia vittata, Parmelia cetrata, Parmelia hypotropa, Parmelia hypotropodes, Parmotrema hypotropodes.
Common name: powdered ruffle lichen.
Parmotrema hypotropum is a foliose lichen species characterized by its pale green to grayish-green thallus with lobes 2-5 mm wide, often with cilia-like structures along the margins. In East and Central Texas, it typically grows on trees, particularly oak and cedar, in shaded areas with high humidity. The species is relatively common in the region, found in a variety of habitats including deciduous forests, woodland edges, and urban landscapes. Its distribution spans from the Piney Woods of East Texas to the Hill Country of Central Texas, often at elevations below 500 meters.
Powdered ruffle lichen (Parmotrema hypotropum) on bushes in semi-open area at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
127 Parkview Dr, Somerville, TX 77879, USA
Powdered ruffle lichen (Parmotrema hypotropum) on a thin twig of a bush at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019705 Lakeview Ln, Somerville, TX 77879, USA
Powdered ruffle lichen (Parmotrema hypotropum) on a twig of a bush in a half-open area at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019801 Lakeview Ln, Somerville, TX 77879, USA
Powdered ruffle lichen (Parmotrema hypotropum) on a fallen oak twig in Lick Creek Park. College Station, Texas, February 3, 2019Post Oak Trail, College Station, TX 77845, USA
Powdered ruffle lichen (Parmotrema hypotropum) on small trees or bushes in half-open area at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, December 21, 2019805 Lakeview Ln, Somerville, TX 77879, USA
Powdered ruffle lichen (Parmotrema hypotropum) on a twig of small trees or bushes in half-open area at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, December 21, 2019805 Lakeview Ln, Somerville, TX 77879, USA
Powdered ruffle lichen (Parmotrema hypotropum) on bushes in semi-open area at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 26, 2020705 Lakeview Ln, Somerville, TX 77879, USA
Powdered ruffle lichen (Parmotrema hypotropum) on a small tree or a bush in half-open area at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 26, 2020705 Lakeview Ln, Somerville, TX 77879, USA
Powdered ruffle lichen (Parmotrema hypotropum) on bushes at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, April 5, 2020805 Lakeview Ln, Somerville, TX 77879, USA
Powdered ruffle lichen (Parmotrema hypotropum(?)) on a fallen oak twig at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, February 24, 2021Lake Somerville Trailway, Somerville, TX 77879, USA
Powdered ruffle lichen (Parmotrema hypotropum) together with a parasitic gall-forming lichenicolous fungus Tremella parmeliarum on a twig of upland swamp-privet bush at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, December 20, 2021Lakeview Drive, Burleson County, Texas, United States
Powdered ruffle lichen (Parmotrema hypotropum) together with a gall-forming lichenicolous fungus Tremella parmeliarum on a bush at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, December 20, 2021Lakeview Drive, Burleson County, Texas, United States
Brown and greenish galls of lichenicolous fungus Tremella parmeliarum on powdered ruffle lichen (Parmotrema hypotropum) on a bush of upland swamp-privet in semi-open area at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, December 20, 2021Lakeview Drive, Burleson County, Texas, United States
Twig of elm tree with folious lichens Teloschistes exilis, Parmotrema hypotropum, Usnea strigosa when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, August 28, 2024
Close-up of a twig of elm tree with folious lichens Teloschistes exilis and Parmotrema hypotropum when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, August 28, 2024
Twig of elm tree with folious lichens Teloschistes exilis and Parmotrema hypotropum when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, August 28, 2024
Powdered ruffle lichen (Parmotrema hypotropum) and Ramalina when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Washington-on-the-Brazos State Historic Site. Washington, Texas, August 29, 2024
Powdered ruffle lichen (Parmotrema hypotropum) and cartilage lichen (Ramalina celastri) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Washington-on-the-Brazos State Historic Site. Washington, Texas, August 29, 2024
Powdered ruffle lichen (Parmotrema hypotropum) from a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, September 1, 2024Observations of Parmotrema hypotropum in East and Central Texas reveal that the species is commonly found on bushes, small trees, and twigs in semi-open to half-open areas. The lichen was observed at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park, Lick Creek Park in College Station, and Washington-on-the-Brazos State Historic Site. It grows on various substrates, including oak twigs, elm trees, and upland swamp-privet bushes. The lichen was also found to be host to a parasitic gall-forming fungus, Tremella parmeliarum. Observations were made over several years, from 2019 to 2024, with the lichen exhibiting consistent characteristics under both daylight and ultraviolet (UV-A) blacklight illumination. The species appears to thrive in the region's environmental conditions, forming associations with other folious lichens like Teloschistes exilis and Ramalina.
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