Acanthothecis verrucosa
Acanthothecis verrucosa is a species of lichen in the family Graphidaceae. It is found in southern Vietnam, where it grows on smooth-barked trees in tropical forests. The lichen is characterized by its olive-green, thallus and the presence of psoromic acid. This species can easily be confused with similar lichens, but it can be distinguished by its specific morphological and chemical features. Taxonomy Acanthothecis verrucosa was first described by Santosh Joshi, Dalip Kumar Upreti, and Jae-Seoun Hur as a new species in 2017. The species name, verrucosa, is derived from the Latin word for "warts" and refers to the wart-like appearance of the lichen's thallus. The type specimen was collected from tree bark in Cát Tiên National Park, Vietnam, in December 2015. Description This lichen features a hard, glossy thallus that is olive-green, green, or dark green, and forms large patches. Its cortex is 25–45 μm thick, and it hosts a Trentepohlia (green algal) . The medulla of the lichen is white and crystalline. The are irregular to shortly and labiate, with white labia that can be straight or internally folded. The is mostly concealed to slightly exposed and has a white surface. The ascospores are hyaline, ellipsoidal, and , measuring