Melampsora salicis-michelsonii sp. nov. on Salix michelsonii and Melampsora salicis-cavaleriei on Salix serrulatifolia from China Author Wang, Li-Li The Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University, Beijing 100083, China & The Key Laboratory of the Pest Monitoring and Safety Control of Crops and Forests, Xinjiang Agricultural University, Urumqi 830052, China Author Li, Ke-Mei The Key Laboratory of the Pest Monitoring and Safety Control of Crops and Forests, Xinjiang Agricultural University, Urumqi 830052, China Author Liu, Yun The Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University, Beijing 100083, China Author Tian, Cheng-Ming The Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University, Beijing 100083, China text Phytotaxa 2020 2020-03-12 435 4 280 292 http://dx.doi.org/10.11646/phytotaxa.435.4.2 journal article 10.11646/phytotaxa.435.4.2 1179-3163 13874719 Melampsora salicis-cavaleriei Tai, Farlowia 3: 102, 1947. FIGURE 3 Spermogonia and aecia unknown. Uredinia epiphyllous, scattered, 0.1–0.3 mm ( Figs. 3A, 3B, 3C ). Urediniospores ellipsoid to clavate, sometimes pyriform and rarely subglobose, 13–30 × 10–17 μm, with wall 1.3–2.3 μm thick ( Fig. 3D ), echinulate, spines 1.05–1.15 μm apart ( Fig. 3I ), 3–5 germ pores, scattered ( Fig. 3E ). Paraphyses capitate, intermixed with urediniospores ( Fig. 3H ), 39–67 × 12–19 μm, with a uniformly thickened membrane up to 4.5 μm ( Fig. 3F ). Telia epiphyllous scattered or aggregated, 0.1–0.4 mm , subepidermal; teliospores 43–61 × 5–9 μm, wall 0.7–1.8 μm, evenly thickened without a thickened apical wall ( Fig. 3G ). Specimens examined :— CHINA , Xinjiang Uygur Autonomous Region: Yili Prefecture, Zhaosu County, II, III on Salix serrulatifolia E. Wolf , 11 September 2014 , coll. L.L. Wang & K.M. Li (HMAAC4043, 4044). Host/distribution :—Leaves of Salix serrulatifolia from China . Notes :— M. salicis-cavaleriei on Salix cavaleriei (HMAS3607) was named and simply described in 1947 in Yunnan Province , China ( Tai 1979 ). Subsequently, an expanded morphological and phylogenetic research of the same specimens was performed by Zhao (2013b) . However, type specimen was too old and rDNA was not obtained. In this study, ITS and LSU regions of M. salicis-cavaleriei were sequenced successfully. It is indicated that the rust on Salix serrulatifolia differs from other species with available sequences. Salix serrulatifolia is a new host record of this Melampsora species.