Abstract
Laetiporus is a cosmopolitan genus of brown rot fungi. In this study, L.medogensis and L.xinjiangensis are described as new species from western China, based on morphological and molecular evidence. L.medogensis has only been found on gymnosperms so far and is distinguished by pinkish-buff to clay-buff pileal surface and buff-yellow pore surface, azonate to faintly zonate pileus and ellipsoid to ovoid basidiospores (5–6.2 × 4.2–5.2 μm). L.xinjiangensis is found on angiosperms and is characterised by pale-buff to clay-pink pileal surface, cream to light yellow pore surface, azonate to faintly zonate pileus, large pores (2–3 per mm) and small basidiospores (4.5–5 × 3–4.2 μm). The phylogeny of Laetiporus is reconstructed with multi-gene sequences including the internal transcribed spacer regions (ITS), the large subunit (nrLSU) and small subunit (nrSSU) of the nuclear ribosomal RNA gene, the small subunit of the mitochondrial rRNA gene (mtSSU), the translation elongation factor 1-α gene (EF-1α) and the second subunit of RNA polymerase II (RPB2). The results show that L.medogensis and L.xinjiangensis formed two distinct lineages belonging to Laetiporus. Illustrated descriptions of the two new species are presented. An identification key to species of L.sulphureus complex is provided.
Highlights
Laetiporus Murrill (Fomitopsidaceae, Polyporales) is a cosmopolitan genus, causing brown rot on living hardwoods and conifers (Murrill 1904)
The current study recognised two new species, namely, L. medogensis and L. xinjiangensis and, altogether, eight Laetiporus species have been found in China far
Laetiporus medogensis and L. ailaoshanensis group together with moderate to low Maximum Parsimony (MP) and Maximum Likelihood (ML) support (50% MP and 53% ML). Both L. medogensis and L. ailaoshanensis are found in Southwest China
Summary
Laetiporus Murrill (Fomitopsidaceae, Polyporales) is a cosmopolitan genus, causing brown rot on living hardwoods and conifers (Murrill 1904). 15 species have been accepted in the genus worldwide and 11 species have been confirmed in the L. sulphureus complex by phylogenetic analyses, of which six have been reported from China: L. ailaoshanensis B.K. Cui & J. Hatt., L. montanus Černý ex Tomšovský & Jankovský, L. sulphureus (Bull.) Murrill, L. versisporus (Lloyd) Imazeki and L. zonatus B.K. Cui & J. Song (Tomšovský and Jankovský 2008, Ota et al 2009, Banik et al 2012, Song et al 2014, Song and Cui 2017). The species in the L. sulphureus complex are characterised by annual basidiocarps, soft and fleshy context and a dimitic hyphal system composed of simple septate generative hyphae and binding hyphae (Burdsall and Banik 2001, Núñez and Ryvarden 2001, Ota et al 2009)
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