Fusarium sulawense N. Maryani, Sand

Fusarium sulawense N. Maryani, Sand. -Den., L. Lombard, Kema & Crous, sp. nov. — MycoBank MB 828963; Fig. 9 Etymology. Name refers to Sulawesi, the island from where this species was collected in Indonesia. Typus. INDONESIA, Desa Seli, Kecamatan Bengo, Bone, Sulawesi Selatan (E 120°1'12.8" S 4°37'26"), on infected pseudostem of Musa acuminata var. Pisang Cere (AAA), 12 Aug. 2015, N. Maryani (holotype specimen and culture, InaCC F 940, preserved in metabolically inactive state). Sporulation abundant from conidiophores carried on aerial mycelium and from sporodochia. Conidiophores on aerial mycelium abundant on PDA and SNA, less frequent on CLA, septate, irregularly or verticillately branched; conidiogenous cells mono- or polyphialidic, subulate to subcylindrical, smooth- and thin-walled, (8.5–)14–22.5(–27) × (2–)2.5–4(–4.5) µm (av. 18 × 3 µm), formed singly, laterally or terminally, or more often in groups of 2–3 cells, sometimes proliferating percurrently, collarettes and periclinal thickening inconspicuous or absent; conidia of one type (macroconidia), falcate and multiseptate, apical cells papillate, basal cells indistinct or foot-shaped, 3–5(–9)-septate, formed on both mono- and polyphialides, 3-septate conidia, 20.5–47.5(–55) × 3.5–5 µm; 5-septate conidia, (33.5–)39.5–48(–50.5) × (4–) 4.5–5.5 µm; 6-sep- tate conidia, 51.5 × 6 µm; 9-septate conidia, 67 × 5.5 µm; av. (20.5–)36–51(–67.5) × (3.5–)4–5.5(–6) µm. Sporodochia formed rarely on CLA after 7 d, pale orange; conidiophores in sporodochia unbranched or irregularly branched, densely packed, bearing terminal clusters of 2–5 conidiogenous cells; conidiogenous cells monophialidic, short ampulliform, smooth- and thin-walled, (8.5–)9–11.5(–13) × (3–)3.5–5(–5.5) µm (av. 10.5 × 4.5 µm) with a minute collarette and inconspicu- ous periclinal thickening; sporodochial conidia falcate, apical cells gently curved, papillate; basal cells slightly curved, footshaped, (3–)5(–6)-septate: 3-septate conidia, (29.5–)30–44 × 4–4.5 µm; 4-septate conidia, 30 × 5.5 µm; 5-septate conidia, (30–)36–41.5(–43.5) × (3.5–)4–5(–5.5) µm; 6-septate conidia 43.5 × 5 µm; av. (30–)36–41.5(–44) × (3.5–)4–5(–5.5) µm. Chlamydospores not observed. Culture characteristics — Colony on PDA showing optimal growth at 25 ° C with an average growth rate of 5.2–6.0 mm/d. Colony reverse rosy buff becoming white towards the margins. Colony surface dry, cottony, saffron.Aerial mycelium abundant, cottony, with high sporulation and lacking exudates. Geography & Host — Bone, South Sulawesi, Musa acuminata var. Pisang Cere (AAA). Pathogenicity — Non-pathogenic on Cavendish (AAA). Additional material examined. INDONESIA, Desa Sungai Birah, Kecamatan Pamukan Barat, Kota Baru, Kalimantan Selatan (E 115°59'982" S 2°22'883"), on infected pseudostem of Musa var. Pisang Hawa (ABB), 19 June 2014, N. Maryani (InaCC F 964). Notes — Fusarium sulawense is relatively fast growing (av.5.2– 6.0 mm/d) compared to its sister species in the Incarnatum clade, FIESC-34 (av. 1.3–2.2 mm /d). Members of this species were recovered from different banana varieties in the Kalimantan and Sulawesi islands of Indonesia.
Published as part of Maryani, N., Sandoval-Denis, M., Lombard, L., Crous, P. W. & Kema, G. H. J., 2019, New endemic Fusarium species hitch-hiking with pathogenic Fusarium strains causing Panama disease in small-holder banana plots in Indonesia, pp. 48-69 in Persoonia 43 on page 65, DOI: 10.3767/persoonia.2019.43.02, http://zenodo.org/record/3565708