Fusarium fecundum S. L. Han, M. M. Wang & L. Cai

Fusarium fecundum S. L. Han, M. M. Wang & L. Cai, Studies in Mycology 104: 87–148. 2023. Fig. 2 Description. On CLA, conidiophores arising from aerial mycelia, 13–71 μm long, unbranched or irregularly branched, bearing terminal or lateral phialides, often reduced to single phialides; Periclinal thickening inconspicuous; Aerial conidia hyaline, smooth, rarely ovoid to falcate, on the apical half, the dorsal side is more curved than the ventral side, and the apical cell is either blunt or hooked, basal cell barely to distinctly notched. 1 - septate conidia: (16 –) 22–21 (– 27) × 4–6 μm (av. 20 × 5 μm, n = 9); 2 - septate conidia: (18 –) 21–28 (– 33) × 5–7 μm (av. 26 × 6 μm, n = 9); 3 - septate conidia: (32 –) 33–36 (– 41) × 5–8 μm (av. 35 × 7 μm, n = 16); 4 - septate conidia: (32 –) 37–43 (– 43) × 6–9 μm (av. 39 × 7 μm, n = 18); 5 - septate conidia: (41 –) 43–48 (– 53) × 7–9 μm (av. 46 × 8 μm, n = 12). Culture characteristics. Colonies on PDA incubated at 25 ° C in the dark, reaching 84–90 mm diameter in 7 d; aerial mycelia dense, white, radiate, colony margin erose; reverse surface greyish yellow in the center, odor absent. On OA in the dark, occupying an entire 90 mm diameter in 7 d; surface white and aerial mycelia scant, crateriform, reverse white, odor absent. Materials examined. China • Yunan Province, Nanuo Mountain, on leaves of Setaria palmifolia, 3 March 2023, Q. Y. Liu (HSAUP 41424, HSAUP 51424), living cultures CGMCC 3.27792 = SAUCC 2414-4, CGMCC 3.27793 = SAUCC 2414-5. Notes. Phylogenetic analysis showed that isolates (SAUCC 2414-4 and SAUCC 2414-5) were closely related to Fusarium fecundum (LC 15875, ex-type strain) (Fig. 1). There are no nucleotide position differences between Fusarium fecundum (SAUCC 2414-4) and Fusarium fecundum (LC 15875, ex-type strain). Morphologically, Fusarium fecundum (SAUCC 2414-4) and Fusarium fecundum (LC 15875, ex-type strain) are the lack of sporodochia. The aerial conidia of Fusarium fecundum (SAUCC 2414-4) are smaller than those of Fusarium fecundum (LC 15875, ex-type strain). Fusarium fecundum was previously isolated from wheat and rice, and it has now been reported for the first time on Setaria palmifolia (Han et al. 2023).