Synonym: Thelotrema rugiferum.
Common name: volcano lichen.
Myriotrema rugiferum is a crustose lichen species characterized by a grayish-brown to dark brown thallus with warty, verruculose surface and numerous rounded to irregularly shaped warts. In East and Central Texas, it typically grows on tree trunks, branches, and rocks in shaded to partially shaded areas, often in humid environments near water sources. The species is relatively common in the region, particularly on hardwood trees such as oak and cedar elm, and can be distinguished from similar species by its unique wart-like structures and absence of soredia or isidia.
Volcano lichen (Myriotrema rugiferum) under some moss strands on a tree in Big Creek Scenic Area of Sam Houston National Forest. Shepherd, Texas, February 1, 2019
Lone Star Hiking Trail, Coldspring, TX 77331, USA
Volcano lichen (Myriotrema rugiferum) 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, USAObservations of Myriotrema rugiferum in East and Central Texas reveal its presence on various substrates. On February 1, 2019, the lichen was found under moss strands on a tree in Big Creek Scenic Area of Sam Houston National Forest, near Shepherd, Texas. Approximately three weeks later, on February 23, 2019, it was observed growing on a fallen oak in the area of Winters Bayou, also within Sam Houston National Forest, but east of Waverly. These findings suggest that Myriotrema rugiferum can thrive on different types of surfaces, including trees and decaying wood, and can be found in similar habitats within the region. The lichen's ability to grow under moss strands indicates its tolerance for shaded and potentially humid environments. Overall, these observations provide insight into the ecological preferences of Myriotrema rugiferum in East and Central Texas.
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