Synonyms: Parmelia galbina, Parmelia subquercifolia, Parmelina galbina.
Common name: Smooth Axil-bristle Lichen.
Myelochroa galbina is a foliose lichen species characterized by its yellow-green to pale green thallus with rounded lobes, typically 2-5 mm wide. It has a medulla containing usnic acid and atranorin. In East and Central Texas, Myelochroa galbina is commonly found growing on trees, particularly oak and elm, in shaded to partially shaded areas. It thrives in the region's humid subtropical climate, often forming dense colonies on trunks and branches. The species is relatively abundant in the eastern part of the region, becoming less common as one moves westward into the drier areas of Central Texas.
Smooth axil-bristle lichen (Myelochroa galbina) on a thin twig of a bush at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
801 Lakeview Ln, Somerville, TX 77879, USA
Smooth axil-bristle lichen (Myelochroa galbina) 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
Smooth axil-bristle lichen (Myelochroa galbina) 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
Close-up of smooth axil-bristle lichen (Myelochroa galbina) 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 StatesObservations of Myelochroa galbina in East and Central Texas show that it grows on thin twigs of bushes and small trees in half-open areas. The lichen was found at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park on multiple occasions, including January 25, 2019, December 21, 2019, and December 20, 2021. It was observed growing on various hosts, such as upland swamp-privet bushes, indicating its adaptability to different environments. Close-up observations revealed the lichen's smooth appearance, consistent with its common name, smooth axil-bristle lichen. The repeated sightings suggest that Myelochroa galbina is a relatively common species in this region, thriving in areas with suitable conditions. Its presence on small trees and bushes indicates a preference for well-lit, possibly disturbed environments.
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