Abstract
Fibrodontia is a genus of wood-inhabiting fungi consisting of four species so far, including F. gossypina as generic type. Two new species, Fibrodontia austrosinensis and F. subalba, are described and illustrated from China. Fibrodontia austrosinensis from southwestern China is characterized by a grandinioid to odontioid hymenophore with numerous small aculei, a dimitic hyphal system with scattered, smooth skeletal hyphae and ellipsoid basidiospores measuring 4.2–5.2 × 3.5–4.5 μm. Fibrodontia subalba from the West Tianshan Mountain in northwestern China is distinguished by an odontioid to hydnoid hymenophore, a dimitic hyphal system, and ellipsoid basidiospores measuring 3.7–4.4 × 2.8–3.4 μm. The phylogenies inferred from the data set of nuc rDNA ITS1-5.8S-ITS2 (ITS) and D1–D2 domains of nuc 28S rDNA (28S), and that of ITS, 28S, translation elongation factor (tef1α), and RNA polymerase II second largest subunit (rpb2) supported Fibrodontia as a monophyletic genus in the Trechisporales, and F. austrosinensis and F. subalba as separate lineages within Fibrodontia. Multi-rate Poisson Tree Processes, Automatic Barcode Gap Discovery and genetic distance methods based on ITS sequences of Fibrodontia also supported F. austrosinensis and F. subalba as distinct species. The taxonomic status of F. fimbriata that was recently transferred from Cystidiodendron, is briefly discussed. A key to all six known species of Fibrodontia is provided.
Highlights
Fibrodontia Parmasto, introduced for F. gossypina Parmasto [1], resembles Hyphodontia J
Because Bayesian inference (BI) and maximum likelihood (ML) algorithms generated nearly congruent topologies, the ML trees are presented with BS values and Bayesian posterior probabilities (BPPs) greater than 50% and 0.8, respectively, shown at the nodes (Figures 1–3)
Two species of Fibrodontia from China, F. austrosinensis and F. subalba, are described as new species based on molecular analyses and morphological features
Summary
Fibrodontia Parmasto, introduced for F. gossypina Parmasto [1], resembles Hyphodontia J. By its resupinate, light-colored basidiocarps with odontioid hymenophores, clamped generative hyphae, and hyaline, thin-walled basidiospores. The presence of skeletal hyphae and the absence of cystidia distinguish Fibrodontia from Hyphodontia [2]. Eriksson et al believed that Fibrodontia was closely allied to Hyphodontia [2] and Langer considered it a synonym of Hyphodontia [3]. Molecular phylogenetic studies place these genera in different orders—Fibrodontia in the trechisporoid clade in the Hydnodontaceae Jülich, Trechisporales K.H. Larss. [4,5], and Hyphodontia in the Hyphodontiaceae Xue W.
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