Melampsora salicis-cavaleriei Tai, Farlowia

Wang, Li-Li, Li, Ke-Mei, Liu, Yun & Tian, Cheng-Ming, 2020, Melampsora salicis-michelsonii sp. nov. on Salix michelsonii and Melampsora salicis-cavaleriei on Salix serrulatifolia from China, Phytotaxa 435 (4), pp. 280-292 : 290

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.

Figures

FIGURE 3. Morphology of Melampsora salicis-cavaleriei (HMAAC4043).A: Habit of sori on leaves. B: Uredinia (U) on the epiphyllous surface. C: Telia (T) on the epiphyllous surface. D: Obovoid and ellipsoid urediniospores observed by LM. E: Scattered germ pores on the urediniospores (red arrows). F: Capitate paraphyses with evenly thickened apex. G: Subepidermal teliospores without thickened apical wall. H: Uredinia observed by SEM, abundant intermixed paraphyses. I: Urediniospores with echinulate spines observed by SEM. Bars: B, C = 1 mm; D−G = 10 μm; H = 50 μm; I = 2 μm.