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A new isidiate species of Arthonia (Ascomycota: Arthoniaceae) from Costa Rica

     Institute of Botany, Karl-Franzens-University Graz, 8010 Graz, Austria

Robert Lücking ¹

     Department of Botany, The Field Museum, 1400 S. Lake Shore Drive, Chicago, Illinois 60605-2496

Loengrin Umaña-Tenorio

     Laboratorio de Hongos, Instituto Nacional de Biodiversidad (INBio), Apdo. 22-3100, Santo Domingo de Heredia, Costa Rica

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.

Key words: Arthoniales, Corcovado National Park, Costa Rica, lichens, lowland rain forest, Ticolichen

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