Menegazzia caviisidia

Menegazzia caviisidia (ツブクダチイ) is a rare species of foliose lichen found in Japan. It was formally described as a new species in 2004 by Jarle Bjerke and Peter James. Characteristics of the lichen include its numerous spherical to finger-like (dactyliform) to narrowly obovate, hollow isidia, and small conical perforations in the thallus. It contains thamnolic acid as the major lichen product in the medulla.