Gerwasia rubi-setchuenensis J. E. Sun, Yong Wang bis & K. D. Hyde 2024

Gerwasia rubi-setchuenensis J. E. Sun, Yong Wang bis & K. D. Hyde, (2024) Fig. 5 Host. Rubus buergeri Miq. Description. Spermogonia, aecia, and telia unknown. Uredinia 0.4–1.0 mm diam., hypophyllous, pulverulent, golden, scattered, irregular, surrounded by host epidermis. Urediniospores 24–30 × 19–25 µm (av. = 27.2 × 22.3 µm, n = 30), subglobose or fusiform, inclusions golden or bright yellow; wall 1.4–2.9 µm thick (av. = 2.0 μm, n = 30), colorless, irregularly elongated verrucae. Materials examined. China • Guizhou Province, Zunyi City, Xishui County (28°49'38"N, 106°41'23"E), 1223 m a. s. l., on the leaves of Rubus buergeri Miq. (Rosaceae), 3 November, 2022, Q. Z. Wu and Q. F. Zhang (GMB 4052); China • Guizhou Province, Zunyi City, Xishui County (28°33'43"N, 106°24'3"E), 1997 m a. s. l., on Rubus buergeri (Rosaceae), 3 November 2022, Q. Z. Wu and Q. F. Zhang (GMB 4075). Notes. In the phylogram (Fig. 1), our collections (GMB 4052 and GMB 4075) clustered with G. rubi-setchuenensis (HGUP 21168). The morphological characteristics of our specimen are consistent with the original description of G. rubi-setchuenensis, and the DNA sequence aligns with that of G. rubi-setchuenensis HGUP 21168 (ITS 100 %; LSU 99.67 %) (Sun et al. 2024). The only difference observed between the descriptions and figure of G. rubi-setchuenensis in Sun et al. (2024) is the size of the urediniospores. The urediniospores of G. rubi-setchuenensis (GMB 4075) are slightly wider than those of G. rubi-setchuenensis (HGUP 21168) (19–25 μm vs. 15–22 μm). This study identifies Rubus buergeri as a new host for this fungus.