Taxonomy and phylogenetic analysis reveal one new genus and three new species in Inonotus s. l. (Hymenochaetaceae) from Brazil Author X, Vitor Author Lima, avier de Author T, Virton Rodrigo Author Oliveira, argino de Author C, Nelson Author Lima-Júnior, orreia de Author C., José Ribamar Departamento de Micologia, Centro de Biociências, Universidade Av. da Engenharia s / n, Recife, Pernambuco Author Oliveira-Filho Federal de Pernambuco, 50740 - 570 (Brazil) Author Santos, Carla Author Lima, Nelson CEB-Centre of Biological Engineering, Micoteca da Universidade do Minho (MUM), University of Minho, Braga (Portugal) Author Gibertoni, Tatiana Baptista Departamento de Micologia, Centro de Biociências, Universidade Federal de Pernambuco, Av. da Engenharia s / n, Recife, Pernambuco 50740 - 570 (Brazil) text Cryptogamie, Mycologie 2022 2022-01-21 20 1 1 21 journal article 10.5252/cryptogamie-mycologie2022v43a1 1776-100X 7828806 Sclerotus Xavier de Lima , gen. nov. TYPE SPECIES . — Sclerotus extensus (Lév.) Xavier de Lima MYCOBANK NUMBER. — MB 833801. ETYMOLOGY. — Scler-,(Greek) hard; otus (Greek) ear. SUBSTRATE. — Dead angiosperm. DESCRIPTION Basidioma perennial, pileate, resupinate to effused-reflexed, hard; pilear surface, when present, initially finely tomentose, but tomentum soon wearing away exposing the black line in the context like a hard crust or cuticle, narrowly sulcated, covering all pileus surface. In section, basidioma applanate, context dark brown; crust glossy, thick. Hyphal system dimitic in context and tube trama. Generative hyphae simple septate. Hyphae darkening in 3% KOH. Hymenial setae present, strongly ventricose, dark, with a narrow lumen. Basidiospores ellipsoid to subglobose, pale yellow, slightly thick-walled, IKI-, CB-. On dead angiosperm. REMARKS This genus differs from other poroid Hymenochaetaceae by the combination of the presence of strongly ventricose and dark hymenial setae and a thick black line that is exposed after the tomentum wears away ( Fig. 5 ). The dimitic nature of tube trama and context, the pigmented thick-walled basidiospores and presence of hymenial setae makes this genus morphologically similar to Phellinus s.s. , but it can be differentiated by the unique hymenial setae. This genus, so far, is represented by a single tropical species, S. extensus .