Pluteus brunneoalbus, a new species, and P. sepiicolor, a new record for China

<p>Two species of <i>Pluteus</i>, namely <i>P. brunneoalbus</i> and <i>P. sepiicolor,</i> from China are reported and illustrated. <i>Pluteus brunneoalbus</i> is described as a new species in <i>P</i>. sect. <i>Celluloderma</i>. This species is characterized by a shallowly depressed pileus, a white stipe, ellipsoid to broadly ellipsoid basidiospores 6–7 × 5–6.5 μm, the presence of few scattered cheilocystidia, the presence of mostly clavate pleurocystidia, and a cutis type pileipellis. In the phylogenetic analysis based on the internal transcribed spacer region (ITS), the new species appears as sister to <i>P</i>. <i>hirtellus</i> and <i>P</i>. <i>squarrosus</i>. In addition to the new species, another species, <i>P</i>. <i>sepiicolor</i>, is reported here as a new record for China. Molecular data support its conspecificity with a collection from Russia. Detailed morphological descriptions including illustrations of the two species from China, and their comparisons with the related taxa of <i>Pluteus</i> are also provided with phylogenetic placement.</p>