Gu Zirui, Zhou Chunqin, Zhang Jianling, Liu Yu, Deng Qiaohua, Yang Rongcong, Yang Shunqiang, Zhao Changlin
The Key Laboratory of Forest Resources Conservation and Utilization in the South-west Mountains of China Ministry of Education, Key Laboratory of National Forestry and Grassland Administration on Biodiversity Conservation in Southwest China, Yunnan Provincial Key Laboratory for Conservation and Utilization of In-forest Re-source, Southwest Forestry University, Kunming 650224, China.
College of Forestry, Southwest Forestry University, Kunming 650224, China.
MycoKeys. 2025 Jul 4;119:197-234. doi: 10.3897/mycokeys.119.157018. eCollection 2025.
Wood-decaying fungi play crucial roles as decomposers in forest ecosystems. In this study, four new wood-inhabiting fungi from Yunnan Province of southwest China-, , , and -are described and illustrated based on morphological and molecular evidence. The species is characterized by its slightly pink to orange basidiomata when dry, a monomitic hyphal system with simple septa, and narrowly ellipsoid basidiospores measuring 3.7-4.4 × 1.9-2.8 µm. The taxon is characterized by its hard, membranous, slightly yellow to yellow basidiomata; a monomitic hyphal system with simple-septate generative hyphae; and ellipsoid basidiospores measuring 3.8-6 × 2.6-3.7 µm. The species is characterized by its membranaceous, slightly gray to pale brown basidiomata; a monomitic hyphal system with simple-septate generative hyphae; and ellipsoid basidiospores measuring 4.3-6.2 × 2.2-3.3 µm. Additionally, the taxon is characterized by its coriaceous, pale cream to buff basidiomata; a monomitic hyphal system with simple-septate generative hyphae; and ellipsoid basidiospores measuring 2.8-3.5 × 1.4-2 µm. Sequences of the internal transcribed spacer region (ITS), the large subunit nuclear ribosomal RNA gene (nLSU), the translation elongation factor 1-α gene (TEF1), the largest subunit of RNA polymerase II (RPB1), and the second subunit of RNA polymerase II (RPB2) of the studied samples were employed, and phylogenetic analyses were performed using maximum likelihood, maximum parsimony, and Bayesian inference methods, ensuring the robustness of the findings. Based on the combined ITS + nLSU + RPB1 + RPB2 + TEF1 dataset, phylogenies of the two families Irpicaceae and Meruliaceae were constructed. In these analyses, was recovered as sister to ; as sister to ; as closely related to and ; and the new species as sister to .
木腐真菌在森林生态系统中作为分解者发挥着关键作用。在本研究中，基于形态学和分子证据，对来自中国西南部云南省的四种新的木生真菌——、、和——进行了描述和图示。物种的特征在于其干燥时略带粉红色至橙色的担子果，具有简单隔膜的单系菌丝系统，以及窄椭圆形的担孢子，大小为3.7 - 4.4×1.9 - 2.8微米。分类单元的特征在于其坚硬、膜质、略带黄色至黄色的担子果；具有简单隔膜的生殖菌丝的单系菌丝系统；以及大小为3.8 - 6×2.6 - 3.7微米的椭圆形担孢子。物种的特征在于其膜质、略带灰色至浅棕色的担子果；具有简单隔膜的生殖菌丝的单系菌丝系统；以及大小为4.3 - 6.2×2.2 - 3.3微米的椭圆形担孢子。此外，分类单元的特征在于其革质、浅奶油色至浅黄色的担子果；具有简单隔膜的生殖菌丝的单系菌丝系统；以及大小为2.8 - 3.5×1.4 - 2微米的椭圆形担孢子。使用了所研究样本的内转录间隔区（ITS）、大亚基核糖体RNA基因（nLSU）、翻译延伸因子1-α基因（TEF1）、RNA聚合酶II的最大亚基（RPB1）和RNA聚合酶II的第二亚基（RPB2）的序列，并采用最大似然法、最大简约法和贝叶斯推断法进行系统发育分析，以确保研究结果的稳健性。基于ITS + nLSU + RPB1 + RPB2 + TEF1组合数据集，构建了多孔菌科和皱孔菌科两个科的系统发育树。在这些分析中，被发现是与的姐妹种；是与的姐妹种；与和密切相关；新物种是与的姐妹种。
