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. 2020 Jan 9;10(1):102.
doi: 10.1038/s41598-019-57061-y.

Basidioradulum Mayi and B. Tasmanicum Spp. Nov. (Hymenochaetales, Basidiomycota) From Both Sides of Bass Strait, Australia

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Basidioradulum Mayi and B. Tasmanicum Spp. Nov. (Hymenochaetales, Basidiomycota) From Both Sides of Bass Strait, Australia

Xue-Wei Wang et al. Sci Rep. .
Free PMC article

Abstract

Basidioradulum was morphologically considered to be a synonym of Xylodon. Here, its independence within Hymenochaetales is confirmed from a phylogenetic perspective. Basidioradulum radula, the generic type, is widely distributed in Northern Hemisphere. Two Southern Hemisphere species close to B. radula are newly described as B. mayi and B. tasmanicum, respectively, from Victoria and Tasmania, Australia. Basidioradulum mayi differs from B. radula by lack of cystidia. Moreover, the hymenial surface of B. radula is normally much more strongly hydnoid than that of B. mayi. Basidioradulum tasmanicum is distinct from B. radula and B. mayi by having capitate cystidia, ellipsoid to subglobose basidiospores, and crystal-covered hyphae. Although morphologically distinct, the two new species isolated by Bass Strait have an almost identical ITS region, and could not be differentiated by nLSU- and ITS-based phylogenetic analyses. This case reminds us that basing phylogeny simply on the ITS as a barcode region may underestimate fungal species diversity.

Conflict of interest statement

The authors declare no competing interests.

Figures

Figure 1
Figure 1
Phylogenetic position of Basidioradulum inferred from the nLSU regions. The topology generated from the maximum likelihood method is presented. Values at nodes are bootstrap and Bayesian posterior probability, respectively, above 50% and 0.8. Newly sequenced specimens are in bold.
Figure 2
Figure 2
Phylogenetic relationship among species of Basidioradulum inferred from the ITS region. The topology generated from the maximum likelihood method is presented. Values at nodes are bootstrap and Bayesian posterior probability, respectively, above 50% and 0.8. Newly sequenced specimens are in bold. The voucher locations of sequences are labeled in parentheses if available. The photos of basidiospores of B. mayi and B. tasmanicum taken from the holotypes are presented after their species names.
Figure 3
Figure 3
Basidiocarps of Basidioradulum mayi and B. tasmanicum. (A) B. mayi (LWZ 20180510-23, holotype). (B) B. mayi (LWZ 20180510-18). (C) B. radula (Zhao 1043). (D) B. radula (Dai 15769). (E) B. tasmanicum (MEL 2403476). (F) B tasmanicum (MEL 2386000). (G) B. tasmanicum (MEL 2385925, holotype). Scale bars = 1 cm.
Figure 4
Figure 4
Microscopic structures of Basidioradulum mayi (drawn from the holotype). (A) Basidiospores. (B) Basidia and basidioles. (C) A section of the basidiocarp.
Figure 5
Figure 5
Microscopic structures of Basidioradulum tasmanicum (drawn from the holotype). (A) Basidiospores. (B) Basidia and basidioles. (C) Capitate cystidia. (D) A section of the basidiocarp.

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