| Summary: | <i>Hymenochaetales</i>, belonging to <i>Agaricomycetes</i>, <i>Basidiomycota</i>, comprises most polypores and corticioid fungi and, also, a few agarics. The latest taxonomic framework accepts 14 families in this order. When further exploring species diversity of <i>Hymenochaetales</i>, two corticioid specimens collected from China producing cystidia with large umbrella-shaped crystalline heads attracted our attention. This kind of cystidia was reported only in three unsequenced species, viz. <i>Tubulicrinis corneri</i>, <i>T. hamatus</i> and <i>T. umbraculus</i>, which were accepted in <i>Tubulicrinaceae</i>, <i>Hymenochaetales</i>. The current multilocus-based phylogeny supports that the two Chinese specimens formed an independent lineage from <i>Tubulicrinaceae</i> as well as the additional 13 families and all sampled genera in <i>Hymenochaetales</i>. Therefore, a monotypic family, <i>Umbellaceae,</i> is newly described with the new genus <i>Umbellus</i> as the type genus to represent this lineage. The two Chinese specimens are newly described as <i>U. sinensis</i>, which differs from <i>T. corneri</i>, <i>T. hamatus,</i> and <i>T. umbraculus</i> in a combination of a smooth to grandinioid hymenophoral surface, not flattened, broadly ellipsoid basidiospores with a tiny apiculus, and growth on angiosperm wood. Due to the presence of the unique cystidia, the three species of <i>Tubulicrinis</i>, even though they lack available molecular sequences, are transferred to <i>Umbellus</i> as <i>U. corneri</i>, <i>U. hamatus,</i> and <i>U. umbraculus</i>. Hereafter, all known species with large umbrella-shaped crystalline-headed cystidia are in a single genus. In summary, the current study provides a supplement to the latest taxonomic framework of <i>Hymenochaetales</i> and will help to further explore species diversity and the evolution of this fungal order.
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