Aquapteridospora fusiformis Z.L. Luo, D.F. Bao, H.Y. Su & K.D. Hyde, sp. nov.
Index Fungorum number: IF 555642 Facesoffungi number: FoF 05414
Etymology: Referring to the fusiform conidia of this fungus.
Holotype: MFLU 18–1601
Saprobic on decaying wood submerged in freshwater. Asexual morph: Colonies on the natural substrate effuse, hairy, pale brown to brown. Mycelium superficial or partly immersed, composed of branched, septate, pale brown to brown, smooth, thin-walled hyphae. Conidiophores (88–)134–188 μm long, 5–7 μm wide (x̄ = 161 × 6 μm, n = 20), macronematous, mononematous, solitary, erect, straight or slightly flexuous, unbranched, cylindrical, septate, smooth, thick-walled, brown at the base, paler towards apex. Conidiogenous cells polyblastic, terminal, later becoming intercalary, pale brown, integrated, with several sympodial proliferations, bearing tiny, protuberant, circular scars. Conidia 14–18 μm long, 5–7 μm wide (x̄ = 16 × 6 μm, n = 20), solitary, fusiform, obtuse at both ends, mostly 3-septate, sometimes 4-septate, slightly constricted at septa, brown to dark brown in central cells and subhyaline at end cells, smooth. Sexual morph Undetermined.
Material examined: CHINA, Yunnan Province, Jizu Mountain, saprobic on decaying wood submerged in a freshwater stream, July 2016, S.M. Tang, S-889 (MFLU 18–1601, holotype), ex-type living culture MFLUCC 18–1606.
Notes: Aquapteridospora fusiformis resembles A. lignicola in having macronematous, solitary, unbranched, septate conidiophores which are brown at the base and paler towards apex, polyblastic, terminal conidiogenous cells and fusiform, septate conidia. Both of these species also share similar size of conidiophores and conidia (Yang et al. 2015). However, A. fusiformis differs from A. lignicola in having pale brown to brown colonies, smooth conidia without a sheath, while the conidia of A. lignicola has large guttules in the middle cells and a conspicuous sheath. Phylogenetic analysis also shows that A. fusiformis and A. lignicola are distinct from other species, but they cluster together with strong support. To further support A. fusiformis as a new species, we compared nucleotide differences with A. lignicola (MFLU 15–1172) following the guidelines of Jeewon and Hyde (2016). Comparison of the 789 nucleotides across the LSU region reveals 9 bp differences. Based on the differences of morphology and DNA nucleotide, we introduce our isolate as new species in Aquapteridospora.
Luo ZL, Hyde KD, Liu JK, Maharachchikumbura SSN et al. 2019 – Freshwater Sordariomycetes. Fungal Diversity 99, 451–660.
Yang J, Maharachchikumbura SSN, Hyde KD, Bhat DJ, McKenzie EHC, Bahkali AH, Jones EBG, Liu ZY (2015). Aquapteridospora lignicola gen. et sp. nov., a new hyphomycetous taxon (Sordariomycetes) from wood submerged in a freshwater stream. Cryptog Mycol 36:469–478.