Four new species of Entoloma subgenus Cyanula (Entolomataceae, Agaricales) from subtropical regions of China

In this study, four species of EntolomasubgenusCyanula (<i>E.orientosinense</i>, <i>E.subgriseosquamulosum</i>, <i>E.subpraegracile</i>, and <i>E.wuyishanense</i>) from subtropical regions of China, are described as new to science based on morphological and phylogenetic analyses. Morphologically, <i>E.orientosinense</i> is characterized by the white basidiomata, relatively large basidiospores, and carneogriseum-type lamellae edge; <i>E.subgriseosquamulosum</i> is recognized by the fuscous pileus, crowded and adnate lamellae, and medium-sized basidiospores; <i>E.subpraegracile</i> is identified by the yellow pileus and intervenose lamellae with sterile or heterogeneous edge; <i>E.wuyishanense</i> is distinct by the blue basidiomata and fertile lamellae edge with slightly bluish pigmentation near the stipe. <i>Entolomaorientosinense</i> belongs to sect. Caesiocincta, subsect. Queletia, and <i>E.wuyishanense</i> belongs to sect. Poliopodes. The remaining two species each form independent branches and do not belong to any known sections. Detailed descriptions, color photos, and a key to related species are presented.