Phanericium bambusacearum Y. L. Deng & C. L. Zhao, 2025

Deng, Yinglian, Chen, Meng, Wang, Kaisheng, Liu, Wanting, Chen, Daxiang, Yang, Shunqiang, Li, Wenli, Zhou, Hongmin & Zhao, Changlin, 2025, Morphological and phylogenetic analyses reveal one new genus and six new species in Irpicaceae and Steccherinaceae (Polyporales, Basidiomycota) from the Yunnan – Guizhou Plateau, Asia, IMA Fungus 16, pp. e 172367-e 172367 : e172367-

Phanericium bambusacearum Y. L. Deng & C. L. Zhao sp. nov.

Figs 15 , 16

Diagnosis.

Phanericium bambusacearum differs from other species in the genus by cream, buff to pale-yellow, cracked hymenophore, generative hyphae bearing simple septa, long clavate basidia, and thin-walled, subglobose basidiospores (4.5–7 × 3.5–5 µm).

Etymology.

Bambusacearum (Lat.): refers to the species growing on bamboo.

Type.

CHINA • Yunnan Province, Zhaotong, Qiaojia County, Yaoshan Town, Yaoshan National Nature Reserve , GPS coordinates: 27°08'N, 103°09'E, altitude 2220 m asl., on the dead bamboo, leg. C. L. Zhao, 23 August 2020, CLZhao 20795 ( SWFC) .

Description.

Basidiomata annual, resupinate, ceraceous, up to 7 cm long, 2.4 cm wide, and 250 µm thick. Hymenophore smooth, cream to buff when fresh, buff to pale-yellow upon drying, cracked; margin cream, up to 1 mm. Hyphal system monomitic; generative hyphae bearing simple septa, colorless, thin-walled, moderately branched, 1.8–3.2 µm in diameter, IKI –, CB –; tissues unchanged in KOH. Subiculum composed of a basal layer and a medullary layer, basal layer with dense texture encrusted with crystals, medullary layer with dense texture, hymenial layer slightly thickening, subhymenium with fairly dense texture. Cystidia and cystidioles absent. Basidia long clavate, smooth, thin-walled, with four sterigmata and a base simple septum, 41–60 × 6–9 µm, basidioles dominant, in shape similar to basidia, but slightly smaller. Basidiospores subglobose, colorless, thin-walled, smooth, IKI –, CB –, (4) 4.5–7 × 3.5–5 µm, L = 6.03 µm, W = 4.47 µm, Q = 1.35 (n = 30 / 1).

Notes.

The phylogenetic analyses (Figs 3 , 4 ) showed that the new species Phanericium bambusacearum is grouped within the genus Phanericium and is sister to P. subglobisporum . However, Phanericium subglobisporum can be delimited from P. bambusacearum by its uncracked hymenial surface, smaller clavate basidia (30–40 × 6.5–8 µm vs. 41–60 × 6–9 µm), and broadly ellipsoid to subglobose basidiospores ( Chen et al. 2021).

Figures

Figure 3. Maximum parsimony strict consensus tree illustrating the phylogeny of Efibula and related species based on ITS + nLSU sequences. Branches are labeled with maximum likelihood bootstrap values higher than 70 % and Bayesian posterior probabilities higher than 0.95, respectively. The new species are shown in bold.

Figure 4. Divergence time estimation of families within Polyporales based on Bayesian evolutionary analysis sampling trees using the combined ITS, nLSU, mtSSU, rpb 2, and tef 1 - α sequence dataset. Posterior probabilities are not less than 0.80, and the mean ages of each node are annotated. The 90 % highest posterior density intervals of divergence time estimates are indicated by horizontal bars.

Figure 15. Basidiomata of Phanericium bambusacearum (holotype 20795). a basidiomata. b macroscopic characteristics of hymenophore. Scale bars: 1 cm (a); 1 mm (b).

Figure 16. Microscopic structures of Phanericium bambusacearum (holotype 20795). a basidiospores. b basidia and basidioles. c a section of the hymenium. Scale bars: 5 µm (a); 10 µm (b, c).