Acantholichen sorediatus

Acantholichen sorediatus is a species of basidiolichen in the family Hygrophoraceae. Found in Costa Rica, it was formally described as a new species in 2016 by Manuela Dal-Forno, Harrie Sipman, and Robert Lücking. The type specimen was collected from the Las [Cruces Biological Station] at an altitude of ; this area is part of the Cordillera [Central, Costa Rica|Cordillera Central]. Here, in the undergrowth of a disturbed primary forest, it was found growing on a tree trunk along with other lichens, including Hypotrachyna, Normandina, and Leptogium. The specific epithet refers to the soredia, found along the margins of the squamules.