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Abstract
The new corticolous species Arthonia isidiata is described from the Pacific lowlands of Costa Rica. A. isidiata is characterized by minute, cylindrical to coralloid isidia produced on the thallus surface. The species currently is known only from the type locality in Corcovado National Park, where it occurs abundantly in the coastal rainforest around Sirena Biological Station.
We like to thank the participants of the second Ticolichen foray for the convivial atmosphere in Costa Rica: José Luis Chaves, Eida Fletes, Daniela Lizano, Harrie Sipman, William Buck, Susan Will-Wolf, Marie Trest and Matthew Nelsen. We are grateful to Ulrike Grube for assistance with the chemical analyses and for providing a photograph of the isidia. The National Science Foundation, Biotic Surveys and Inventories, is acknowledged for financial support to the TICOLICHEN project (Grant DEB-0206125 to The Field Museum, PI Robert Lücking).