Synonyms: Asirosiphon densatulum, Asirosiphon denudatulum, Spilonema densatulum, Spilonema subsimile, Spilonemopsis revertens.
Common name: Rock Hairball Lichen.
Spilonema revertens is a species of lichen that grows on rocks and soil. In East and Central Texas, it typically forms small, dark green to blackish cushions or patches, often with a powdery or granular appearance. The thallus is usually 1-5 cm in diameter, and the apothecia are rare or absent. It can be found on a variety of substrates, including limestone, sandstone, and caliche, in areas with low to moderate vegetation cover.
Blue-edged scale lichen (Psorula rufonigra) (olivaceous) on a filamentous cyanolichen Spilonema revertens (black) in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
Unnamed Road, Llano, TX 78643, USAIn East and Central Texas, observations of the lichen species Spilonema revertens have been recorded. Specifically, at Enchanted Rock State Natural Area in Fredericksburg, Texas, on December 25, 2018, a notable sighting was made. The blue-edged scale lichen (Psorula rufonigra) with an olivaceous hue was found growing on top of the filamentous cyanolichen Spilonema revertens, which has a black appearance. This interaction between the two lichens is of interest, as it highlights the complex relationships within lichen communities. The presence of Psorula rufonigra on Spilonema revertens suggests a possible symbiotic or commensal relationship, where one species may benefit from the other's presence. Further study is needed to fully understand the dynamics at play in this observed association between these two lichen species in the region. This sighting provides valuable insight into the diversity and interactions of lichens in East and Central Texas.
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