This is a newly described taxon from Costa Rica (Mycotaxon 113: 475-483. 2010); it has been collected in Quercus forests in Cartago and San José provinces. T. oradivensis (top photograph) is similar to T. balloui (bottom photograph) in appearance, but exhibits differences in typical basidiome size, basidiome coloration, basidiospore size and shape, typical pleurocystidial shape, and DNA sequence characters. Molecular data suggest that T. oradivensis and T. balloui share a relatively recent common ancestor and lend support to the hypothesis of a biogeographic connection between oak forests of the eastern United States and Central America.