Arthonia Ach.
Fungi | Ascomycota | Arthoniomycetes | Arthoniales | Arthoniaceae | Arthonia
fully shaded lower trunk
Corcovado National Park (Osa Conservation Area), Sector Sirena, Sirena Biological Station: 160 km SSE of San José and 50 km WSW of Golfito, round trail NW of station (Sendero Sirena and Sendero Guanacaste)