Neoacrodontiella eucalypti Crous & M.J. Wingf., sp. nov.

MycoBank number: MB 830845; Index Fungorum number: IF 830845; Facesoffungi number: FoF;

Etymology. Name refers to Eucalyptus, the host genus from which this fungus was isolated.

Mycelium consisting of branched, septate, hyaline, smooth, 2– 3 mm diam hyphae. Conidiophores aggregated in sporodochia, arising from a hyaline stroma, subcylindrical, smooth, branched, multiseptate, 30 – 50 × 3 – 4 mm. Conidiogenous cells terminal and intercalary, subcylindrical, irregularly curved, rarely straight, with apical taper, 20– 30 × 2.5– 3 mm, with pimple-like loci, not to slightly thickened. Conidia solitary, hyaline, smooth-walled, guttulate, fusoid, straight, aseptate, apex subacute, base truncate, not to slightly thickened, (11–)12 –15(–17) × (2.5 –)3(– 3.5) mm. Culture characteristics — Colonies erumpent, spreading, surface folded, with sparse aerial mycelium and smooth, lobate margin, reaching 15 mm diam after 2 wk at 25 °C. On MEA, PDA and OA surface and reverse luteous to orange.

Typus. MALAYSIA, on leaves of Eucalyptus urophylla (Myrtaceae), 31 Mar. 2018, M.J. Wingfield, HPC 2392 (holotype CBS H-23955, culture ex-type CPC 35693 = CBS 145561, ITS and LSU sequences GenBank MK876396.1 and MK876437.1, MycoBank MB830845).

Notes — Neoacrodontiella is somewhat reminiscent of Acro­ dontiella (Seifert et al. 2011), though distinct in that it forms sporodochia, and the conidiogenous loci are flattened and more prominent than in Acrodontiella, with conidia also having prominently truncate hila. No significant hits were obtained when the ITS sequence was used in a megablast search of NCBIs GenBank nucleotide database; the closest hits were with Corticifraga peltigerae (GenBank KY462801.1; Identities = 377/451 (84 %), 42 gaps (9 %)), Taitaia aurea (GenBank NR_160480.1; Identities = 367/444 (83 %), 36 gaps (8 %)) and Gomphillus americanus (GenBank KY381580.1; Identities = 177/181 (98 %), no gaps). Closest hits using the LSU sequence are ‘Spermospora avenae’ (GenBank MH878416.1; Identities = 790/825 (96 %), 2 gaps (0 %)), Cyto­ sporella chamaeropis (GenBank MH871929.1; Identities = 759/ 810 (94 %), 4 gaps (0 %)) and Acarospora thamnina (GenBank KF024746.1; Identities = 475/508 (94 %), 4 gaps (0 %)). The LSU sequence of Spermospora avenae is most likely incorrect as it is not congeneric with other sequences of the genus in the database.

Species