New Species and Combinations in the Cerrenaceae (Polyporales, Basidiomycota)

The classification and taxonomy of the Polyporales have undergone tremendous change and made significant progress in the last ten years. A case in point is the Cerrenaceae that was created just five years earlier. This is one of the smaller, lesser-known families with just five recognized genera and is well-defined and supported by phylogenetic analyses but difficult to characterize by morphology. Some genera and species in the Cerrenaceae display a range in basidiome habit, hymenophore configuration, and hyphal system that overlap with species from other families in the Polyporales and Agaricales. In this study, we clarify the morphological features that distinguish genera in the Cerrenaceae by conducting taxonomic studies in Irpiciporus, Pseudolagarobasidium, Pseudospongipellis, and Radulodon and presenting keys to the accepted species. Generic descriptions for Irpiciporus and Radulodon are revised. Two new taxa are described and illustrated, namely, Irpiciporus rajchenbergii from Brazil and Pseudospongipellis tomsovskyi from southwestern United States. In addition, four new combinations are proposed — Irpiciporus africanus, I. decolorans, I. revolubilis, and Pseudolagarobasidium cirrhatinum. Radulodon acacia, from India, is placed in synonymy under Pseudolagarobasidium acaciicola, and Irpiciporus noharae, from Japan, is confirmed to be a synonym of Lopharia mirabilis.