Spodocybe umbilicata (Hygrophoraceae, Agaricales), a newly discovered species from subtropical China Author Xiao, Ying-Qun 0009-0007-8818-3735 College of Life Sciences, Hunan Normal University, Changsha 410081, China & 445253834 @ qq. com; https: // orcid. org / 0009 - 0007 - 8818 - 3735 445253834@qq.com Author Li, Hai-Jiao 0000-0002-7227-4479 National Institute of Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention, Beijing 100050, China & lihaijiao 715 @ 126. com; https: // orcid. org / 0000 - 0002 - 7227 - 4479 Author Li, Sai-Nan 0000-0002-8818-446X College of Life Sciences, Hunan Normal University, Changsha 410081, China & 201910140177 @ hunnu. edu. cn; https: // orcid. org / 0000 - 0002 - 8818 - 446 X 201910140177@hunnu.edu.cn Author Chen, Zuo-Hong 0000-0001-7359-0257 College of Life Sciences, Hunan Normal University, Changsha 410081, China & chenzuohong @ 263. net; https: // orcid. org / 0000 - 0001 - 7359 - 0257 Author Zhang, Ping 0000-0002-8751-704X College of Life Sciences, Hunan Normal University, Changsha 410081, China & zhangping 0000 @ 163. net; https: // orcid. org / 0000 - 0002 - 8751 - 704 X Author He, Zheng-Mi 0000-0001-8754-3427 College of Life Sciences, Hunan Normal University, Changsha 410081, China & zhengmihe @ hunnu. edu. cn; https: // orcid. org / 0000 - 0001 - 8754 - 3427 zhengmihe@hunnu.edu.cn text Phytotaxa 2023 2023-10-19 620 4 273 282 http://dx.doi.org/10.11646/phytotaxa.620.4.3 journal article 10.11646/phytotaxa.620.4.3 1179-3163 Key to the known Spodocybe species in the world 1. Pileus medium-sized, the diameter usually 30–80 mm ......................................................................................................................2 - Pileus small-sized, the diameter usually 10–30 mm ..........................................................................................................................3 2. Lamellae crowded; flesh without a smell of cyanide ....................................................................................................... S . herbarum - Lamellae distant; flesh with a smell of cyanide ............................................................................................................... S . cyanolens 3. Basidia 2-spored .................................................................................................................................................................. S . bispora - Basidia 4-spored .................................................................................................................................................................................4 4. Lamellae with abundant furcation..................................................................................................................................... S . fontqueri - Lamellae without or with a few furcation ..........................................................................................................................................5 5. Pileus smooth and glabrous................................................................................................................................................... S . collina - Pileus not smooth, surface finely tomentose, felty or rugose.............................................................................................................6 6. Pileus finely tomentose.......................................................................................................................................................................7 - Pileus finely felty or rugose................................................................................................................................................................8 7. Basidiospores 3.3–4.9 × 2.2–3.8 μm, broadly ellipsoid to ellipsoid ............................................................................... S . tomentosa - Basidiospores 5.5–7.5 × 3.0–4.0 μm, elongate.............................................................................................................. S . trulliformis 8. Pileus finely felty; basidiospores 6.0–9.0 × 3.0–4.5 μm; pileipellis with outgrowths and branches .............................. S . umbilicata - Pileus rugose; basidiospores 5.0–6.0 × 3.0–3.5 μm; pileipellis without outgrowths and branches ............................... S . rugosiceps