Four new foliicolous lichen species are described from the Biosphere Reserve “La Amistad” (Cordillera de Talamanca), Costa Rica: Byssoloma carneum with yellowish apothecia and crystalline exciple; Fellhanera tubulifera with tubular, campylidia-like pycnidia; Porina flavopapillata with subglobose, reddish perithecia provided with short, irregular, yellowish squamules and 15-septate ascospores; and Trichothelium chlorinum with minute, greenish perithecia provided with short, irregular setae and 3-septate ascospores. Based on new collections, Badimia tuckermanii is emended to cover an essentially neotropical taxon and excluding the paleotropical B. elixii.
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