| Περίληψη: | In this present study, five new wood-inhabiting fungal taxa, <i>Botryobasidium gossypirubiginosum</i>, <i>Botryobasidium incanum</i>, <i>Botryobasidium yunnanense</i>, <i>Coltricia zixishanensis</i>, and <i>Coltriciella yunnanensis</i> are proposed. <i>Botryobasidium gossypirubiginosum</i> is distinguished by its slightly rubiginous hymenial surface, monomitic hyphal system, which branches at right angles, and subglobose, smooth basidiospores (14–17.5 × 13–15.5 µm); <i>B. incanum</i> is characterized by its white to incanus basidiomata having a hypochnoid hymenial surface, and ellipsoid, smooth basidiospores (6.5–8.5 × 3.5–5 µm); <i>B. yunnanense</i> is characterized by its buff to slightly yellowish hymenial surface, monomitic hyphal system, and broadly ellipsoid to globose, smooth, thick-walled basidiospores (11.5–14.5 × 9.5–10.5 µm); <i>Coltricia zixishanensis</i> differs in its rust brown pileal surface, and ellipsoid, thick-walled basidiospores (5–6.5 × 4–4.5 µm). <i>Coltriciella yunnanensis</i> is distinguished by its tiny pilei, short stipe, and navicular, verrucose basidiospores (10.5–12.5 × 6–7 µm). Sequences of ITS and <i>nLSU</i> genes were used for phylogenetic analyses using the maximum likelihood, maximum parsimony, and Bayesian inference methods. The phylogenetic results inferred from ITS sequences revealed that <i>B. gossypirubiginosum</i> was closely related to <i>B. robustius</i>; the species <i>B</i>. <i>incanum</i> was grouped with <i>B. vagum</i>; <i>B. yunnanense</i> was related to <i>B. indicum</i>. The species <i>C. zixishanensis</i> was grouped with <i>C. confluens</i> and <i>C. perennis</i>. ITS sequences revealed that <i>C. zixishanensis</i> was grouped into the genus <i>Coltriciella</i>, in which it was grouped with <i>Co. globosa</i> and <i>Co. pseudodependens</i>.
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