Synonyms: Collema cyanascens, Collema cyanescens, Collema tremelloides, Leptogium caesium, Leptogium tremelloides, Lichen cyanescens, Parmelia cyanescens, Verrucaria cyanescens.
Common names: Blue Jellyskin, blue-blue vinyl.
Leptogium cyanescens is a foliose lichen species characterized by its bluish-gray to grayish-green thallus, often with a powdery or pruinose surface. In East and Central Texas, it typically grows on trees, particularly oak and cedar, in shaded to partially shaded areas. The thallus is 5-15 cm in diameter, with lobes 1-5 mm wide, and the apothecia are rare, but when present, are 1-3 mm in diameter. It prefers moist, humid environments, and is often found near streams or in wooded areas with rich soil.
Epiphytic foliose cyanolichen Leptogium cyanescens (blue jellyskin) on a stem of wax-leaf privet in Hensel Park. College Station, Texas, December 30, 2018
311 E Brookside Dr, Bryan, TX 77801, USA
Blue jellyskin lichen (Leptogium cyanescens) on a magnolie or holly tree in Big Creek Scenic Area of Sam Houston National Forest. Shepherd, Texas, January 5, 2019Lone Star Hiking Trail, Coldspring, TX 77331, USA
Cyanolichen Leptogium cyanescens (blue jellyskin) in Hensel Park. College Station, Texas, February 12, 2019311 E Brookside Dr, Bryan, TX 77801, USA
Blue jellyskin lichen (Leptogium cyanescens) on an iron foot bridge across the bayou in area of Winters Bayou in Sam Houston National Forest, east from Waverly. Texas, February 23, 2019Lone Star Hiking Trail, Cleveland, TX 77328, USA
Blue jellyskin lichen (Leptogium cyanescens) on a fallen oak in area of Winters Bayou in Sam Houston National Forest, east from Waverly. Texas, February 23, 201915451 FM1725, Cleveland, TX 77328, USA
Epiphytic foliose cyanolichen Leptogium cyanescens (blue jellyskin) on a tree on Lone Star Hiking Trail near Pole Creek in Sam Houston National Forest. Richards, Texas, March 1, 201923404 Martha Williams Rd, Montgomery, TX 77356, USA
Blue jellyskin cyanolichen (Leptogium cyanescens) in Washington-on-the-Brazos State Historic Site. Washington, Texas, July 7, 202123400 Park Rd 12, Washington, TX 77880, USAObservations of Leptogium cyanescens in East and Central Texas reveal its presence on various substrates, including tree stems, trunks, and branches. The lichen was found on different tree species, such as wax-leaf privet, magnolia or holly, oak, and unspecified trees. It was also observed on non-vegetative surfaces, like an iron foot bridge. Locations with recorded sightings include Hensel Park in College Station, Big Creek Scenic Area of Sam Houston National Forest, Winters Bayou area, Lone Star Hiking Trail near Pole Creek, and Washington-on-the-Brazos State Historic Site. The observations span from December 2018 to July 2021, indicating the lichen's year-round presence in the region. The variety of substrates and locations suggests that Leptogium cyanescens is adaptable and widespread in East and Central Texas. Its growth was documented on both living trees and fallen branches, demonstrating its ability to thrive in different environments.
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