Abstract
Four new wood-inhabiting fungal species, Lyomyces bambusinus, L. cremeus, L. macrosporus and L. wuliangshanensis, are proposed based on a combination of morphological and molecular evidence. Lyomyces bambusinus is characterized by resupinate basidiomata with colliculose to tuberculate hymenial surface and broadly ellipsoid, hyaline, slightly thick-walled, smooth basidiospores. Lyomyces cremeus is characterised by resupinate basidiomata with smooth, cream hymenial surface and ellipsoid, hyaline, thin-walled to slightly thick-walled basidiospores. Lyomyces macrosporus is characterized by pruinose basidiomata with reticulate hymenial surface, presence of three kinds of cystidia and larger basidiospores (6.7–8.9 × 4.4–5.4 µm). Lyomyces wuliangshanensis is characterized by coriaceous basidiomata and ellipsoid, hyaline, slightly thick-walled, smooth basidiospores. The phylogenetic analyses based on molecular data of the internal transcribed spacer (ITS) region sequences revealed that the four new species belonged to Lyomyces. Lyomyces bambusinus grouped with L. sambuci. Lyomyces cremeus clade was sister to a clade comprised of L. microfasciculatus. Lyomyces macrosporus was sister to L. allantosporus. Lyomyces wuliangshanensis was closely related to L. mascarensis.
Highlights
Lyomyces bambusinus was sisiter to L. sambuci, but morphologically L. sambuci differs from L. bambusinus by having ellipsoid to oblong, narrower basidiospores (4.5–6 × 3–3.5 μm, Yurchenko et al 2017)
Lyomyces cremeus formed a monophyletic lineage with strong supports (100% Branch support (BS), 100% BP, 1.00 Bayesian posterior probabilities (BPP); Fig. 1) and was sister to a clade comprised of L. microfasciculatus, L. mascarensis, and L. wuliangshanensis
L. microfasciculatus differs in odontioid hymenophore and presence of minute peg-like fascicles of hyphae (Yurchenko and Wu 2014)
Summary
Molecular studies on Lyomyces and related genera have been carried out recently (Riebesehl and Langer 2017; Yurchenko et al 2017; Viner et al 2018; Riebesehl et al 2019). The clarification of Lyomyces sambuci complex was conducted based on ITS and 28S sequences analyses and four new species of Lyomyces were described (Yurchenko et al 2017). Viner et al (2018) studied the taxonomy of Lagarobasidium and Xylodon, and showed that twelve species clustered into Lyomyces clade and grouped with Xylodon clade. Phylogenetic and morphological studies on Xylodon showed that Xylodon was distinct from Hastodontia, Hyphodontia, Kneiffiella and Lyomyces and the Lyomyces generic species L. sambuci was sister to L. crustosus (Pers.) P. The authors expand samplings from previous studies (Gafforov et al 2017; Riebesehl and Langer 2017) to examine taxonomy and phylogeny of them within Lyomyces, based on the internal transcribed spacer (ITS) regions sequences
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