Steccherinum tenuissimum and S. xanthum spp. nov. (Polyporales, Basidiomycota): New species from China

Abstract

Two new wood-inhabiting fungal species, Steccherinum tenuissimum and S. xanthum spp. nov. are described based on a combination of morphological features and molecular evidence. Steccherinum tenuissimum is characterized by an annual growth habit, resupinate basidiomata with an odontioid hymenial surface, a dimitic hyphal system with clamped generative hyphae, strongly encrusted cystidia and basidiospores measuring 3–5 × 2–3.5 μm. Steccherinum xanthum is characterized by odontioid basidiomata and a monomitic hyphal system with generative hyphae bearing clamp connections and covering by crystals, colourless, thin-walled, smooth, IKI–, CB–and has basidiospores measuring 2.7–5.5 × 1.8–4.0 μm. Sequences of the ITS and nLSU nrRNA gene regions of the studied samples were generated, and phylogenetic analyses were performed with maximum likelihood, maximum parsimony and Bayesian inference methods. The phylogenetic analyses based on molecular data of ITS + nLSU sequences showed that two new Steccherinum species felled into the residual polyporoid clade. Further investigation was obtained for more representative taxa in Steccherinum based on ITS + nLSU sequences, which demonstrated that S. tenuissimum and S. xanthum were sister to S. robustius with high support (100% BP, 100% BS and 1.00 BPP).

A phylogenetic and taxonomic study on Steccherinum (Polyporales, Basidiomycota): Focusing on three new Steccherinum species from southern China

“…However, S. aggregatum is distinguished from S. punctatum by having longer cystidia (100–150 × 10–12 µm) and smaller basidia (15–20 × 4–5 µm; Hjortstam et al., 1990 ); S. fragile differs in having the fragile basidiomata and smaller basidiospores (2.8–3.1 × 2.1–2.2 μm; Liu and Dai, 2021 ). Steccherinum xanthum is distinguished from S. punctatum in having smaller basidia (10–19.3 × 3–5.2 μm; Wu et al., 2021b ).…”

“…It is a cosmopolitan genus characterized by a combination of resupinate to effused-reflexed or pileate basidiome with a membranaceous consistencey, hymenophore odontioid to hydnoid, a dimitic hyphal structure with clamp connections or simple-septate generative hyphae, cystidia numerous, strongly encrusted in the obtuse apex, basidia subclavate and basidiospores hyaline, thin-walled, smooth, ellipsoid to subcylindrical, acyanophilous and negative in Melzer’s reagent ( Fries, 1821 ; Gray, 1821 ; Bernicchia and Gorjón, 2010 ). So far, about 80 species have been accepted in this genus worldwide ( Fries, 1821 ; Banker, 1906 ; Banker, 1912 ; Cunningham, 1958 ; Snell and Dick, 1958 ; Lindsey and Gilbertson, 1977 ; Ryvarden, 1978 ; Lindsey and Gilbertson, 1979 ; Burdsall and Nakasone, 1981 ; Melo, 1995 ; Legon and Roberts, 2002 ; Yuan and Dai, 2005a ; Spirin et al., 2007 ; Hjortstam and Ryvarden, 2008 ; Bernicchia and Gorjón, 2010 ; Miettinen et al., 2012 ; Yuan and Wu, 2012 ; Miettinen and Ryvarden, 2016 ; Westphalen et al., 2018 ; Liu and Dai, 2021 ; Westphalen et al., 2021 ; Wu et al., 2021a ; Wu et al., 2021b ; Dong et al., 2022 ). In recent years, several new Steccherinum species were described in China, S. fragile Z.B.…”

A phylogenetic and taxonomic study on Steccherinum (Polyporales, Basidiomycota): Focusing on three new Steccherinum species from southern China

“…However, S. aggregatum is distinguished from S. punctatum by having longer cystidia (100-150 × 10-12 µm) and smaller basidia (15-20 × 4-5 µm; Hjortstam et al, 1990); S. fragile differs in having the fragile basidiomata and smaller basidiospores (2.8-3.1 × 2.1-2.2 mm; Liu and Dai, 2021). Steccherinum xanthum is distinguished from S. punctatum in having smaller basidia (10-19.3 × 3-5.2 mm;Wu et al, 2021b).…”

“…New DNA sequencing techniques have revolutionized the researches of fungal taxonomy and diversity, in which about 150 thousand species of fungi have been described (Hyde, 2022). Wood decaying fungi have been studied intensively in recent years (Bernicchia and Gorjoń, 2010;Dai, 2011;Cui et al, 2019;Guan et al, 2020;Wang and Zhao, 2021;Westphalen et al, 2021;Wu et al, 2021a;Wu et al, 2021b;Wu et al, 2021b;Qu et al, 2022;Wu et al, 2022a;Wu et al, 2022b), but the hydnoid species in the order Polyporales are still not well investigated in China, especially in the subtropics and tropics. In the present study, three new species, Steccherinum fissurutum, S. punctatum and S. subtropicum spp.…”

“…It is a cosmopolitan genus characterized by a combination of resupinate to effused-reflexed or pileate basidiome with a membranaceous consistencey, hymenophore odontioid to hydnoid, a dimitic hyphal structure with clamp connections or simple-septate generative hyphae, cystidia numerous, strongly encrusted in the obtuse apex, basidia subclavate and basidiospores hyaline, thin-walled, smooth, ellipsoid to subcylindrical, acyanophilous and negative in Melzer's reagent (Fries, 1821;Gray, 1821;Bernicchia and Gorjoń, 2010). So far, about 80 species have been accepted in this genus worldwide (Fries, 1821;Banker, 1906;Banker, 1912;Cunningham, 1958;Snell and Dick, 1958;Lindsey and Gilbertson, 1977;Ryvarden, 1978;Lindsey and Gilbertson, 1979;Burdsall and Nakasone, 1981;Melo, 1995;Legon and Roberts, 2002;Yuan and Dai, 2005a;Spirin et al, 2007;Hjortstam and Ryvarden, 2008;Bernicchia and Gorjoń, 2010;Miettinen et al, 2012;Yuan and Wu, 2012;Miettinen and Ryvarden, 2016;Westphalen et al, 2018;Liu and Dai, 2021;Westphalen et al, 2021;Wu et al, 2021a;Wu et al, 2021b;Dong et al, 2022). In recent years, several new Steccherinum species were described in China, S. fragile Z.B.…”