Neopyrenochaeta chiangraiensis Z.L. Luo, W.J. Li & K.D. Hyde
Index Fungorum number: IF557156, Faceoffungi number: FoF 07482
Etymology: Named after the city from where this fungus was collected, Chiangrai.
Saprobic on submerged decaying wood in freshwater habitat. Sexual morph: undetermined. Asexual morph: Conidiomata 120–130 µm diam., 80–130 µm high, dark brown to black, pycnidial, solitary, superficial, globose to subglobose, unilocular, setose, ostiolate. Ostiole circular, papillate, centrally located. Setae 65–120 × 2–4 µm, conspicuous, dark brown at the base, becoming paler and tapered toward apex, subulate, straight or slightly curved, unbranched, septate, originating from the surface of the conidiomatal wall. Conidiomatal wall 15–30 µm wide, composed of thick-walled, dark brown to hyaline cells of textura angularis. Conidiophores reduced to conidiogenous cells. Conidiogenous cells 5–7 × 2–3 µm, formed in the inner cavity of conidiomata, hyaline, enteroblastic, phialidic, doliiform to ampulliform, determinate, smooth-walled, with periclinal thickenings towards apex at the collarette zone. Conidia 4–6 × 2–3 µm ( = 4.5 × 2.4 µm; n = 50), hyaline, oval or oblong, rounded at the both ends, unicellular, thick- and smooth-walled, with one large or many smaller guttules.
Material examined: Thailand, Chiang Rai, on submerged decaying wood in freshwater pool, 1 October 2013, Asanka Ranjana Bandara, ZL-17 (MFLU 15-0086, holotype), ex-type living culture MFLUCC 13-0881, (KUN, HKAS 86461, isotypes).
Notes: Neopyrenochaeta chiangraiensis shows a closely affinity with the generic type N. acicola, but formed a separate branch. Neopyrenochaeta chiangraiensis shares similar characters with N. acicula in having globose to subglobose conidiomata with setae and subglobose to ellipsoidal conidia with several small or large guttules (conidia: 3.5–5(–6) × 1.5–3 µm), but is distinct in dimensions of setae. Neopyrenochaeta chiangraiensis has shorter setae than N. acicula (up to 200 µm).
Neopyrenochaeta chiangraiensis (MFLU 15-0086, holotype) a, b, d Appearance of dark brown to black conidiomata on the host. c Seta. e Surface view of conidioma with setae. f Section of peridium. h, i Vertical sections of conidiomata. g Germinating conidium. j, k Conidiogenous cells and developing conidia. l–r Conidia. Scale bars b, d–e = 100 µm, c, f–g, l = 20 µm, h–i = 50 µm, j–k, m–r = 5 µm.
Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.