Fungalpedia – Note 859, Pseudonectriella
Pseudonectriella. Petr.
Citation when using this data: Huang SK et al. 2021 (in prep.) – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank., Fig 1
Classification: Niessliaceae, Hypocreales, Hypocreomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Fungi
Saprobic or parasitic on wood. Sexual morph: Ascomata perithecial, solitary, superficial, turbinate, obpyriform to subglobose, or deep collapsing as cupuliform, 3–8-loculate, dark brown to black, membranaceous, tuberculate, glabrous, ostioles inconspicuous, periphysate. Peridium composed of membranaceous, brown to pale brown to hyaline cells of textura globulosa to textura angularis to textura prismatica. Paraphyses rare, filiform, septate. Asci 8-spored, unitunicate, cylindrical, pedicellate, apex rounded, apical ring absent, evanescent. Ascospores uni- or bi-seriate, hyaline, ellipsoidal to oval, 0–1-septate, smooth-walled, guttulate. Asexual morph: Coelomycetous. Conidiomata superficial, turbinate, obpyriform to subglobose, or deep collapsing as cupuliform, 3–8-loculate, dark brown to black, membranaceous, tuberculate. Peridium composed of membranaceous, brown to pale brown cells of textura globulosa to textura angularis to textura prismatica, becoming hyaline towards inner conidiogenous region. Conidiophores erect, hyaline, cylindrical to subcylindrical, unbranched. Conidia terminal, oval to ellipsoidal, aseptate, hyaline, smooth-walled, guttulate (adapted from Petrak 1959).
Notes – The monotypic Pseudonectriella is typified by P. ahmadii which has black ascomata, cylindrical asci and ellipsoidal ascospores (Petrak 1959). Lumbsch & Huhndorf (2007) placed this genus in Niessliaceae. However, no sequence data is available for the Pseudonectriella.
Type species: Pseudonectriella ahmadii Petr., Sydowia 13(1-6): 128 (1959).
Other accepted species: Species Fungorum – search Pseudonectriella.
Figure 1 – Pseudonectriella ahmadii: a–c, e, q–r, s, w (BPI-1110420, holotype); d, f–p, t–v (S-F8085, Isotype). a Material. b–d Ascomata on the host. e–f Ascomata cross section. g Peridium of ascomata. h–n Asci. o–r Ascospores. s Peridium of conidiomata. t Conidiophores and conidia.u Mature asci and conidiophores in the same locule. v Wall cells of ascomata towards inner conidiogenous region (enlarged view of the conidiophores part of u). w Conidiophores and conidia in conidiomata. Notes: u–w stained in cotton blue reagent. Scale bars: b–d = 200 µm, e–f = 100 µm, b, b = 50 µm, h–k, s = 20 µm, l–n, t, v–w = 10 µm, o–r = 2 µm.
References
Lumbsch HT, Huhndorf SM. 2007 – Outline of ascomycota–2007. Myconet 13, 1–58.
Petrak F. 1959 – Pseudonectriella n.gen., eine neue Gattung der Nectriaceen aus Pakistan. Sydowia 13(1–6), 127–130.
Entry by
Shi-Ke Huang, State Key Laboratory Breeding Base of Green Pesticide and Agricultural Bioengineering, Key Laboratory of Green Pesticide and Agricultural Bioengineering, Ministry of Education, Guizhou University, Guiyang 550025, China, The Engineering Research Center of Southwest Bio-Pharmaceutical Resources, Ministry of Education, Guizhou University, Guiyang 550025, Guizhou Province, China, Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand, School of Science, Mae Fah Luang University, Chiang Rai 57100, Thailand, The Mushroom Research Centre, Guizhou University, Guiyang 550025, China
Published online 14 September 2021