Fungalpedia – Note 1074, Xenoacremonium
Xenoacremonium L. Lombard & Crous
Citation when using this data: Dayarathne MC et al. 2020 (in prep.) – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig 1
Classification: Nectriaceae, Hypocreales, Hypocreomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Fungi
Saprobic on wood. Sexual morph: Stromata erumpent, orange to brown, pseudoparenchymatous, cells forming textura angularis, intergrading with ascomatal wall. Ascomata superficial, aggregated in groups of 2–3, brown, subglobose to globose. Peridium 50–90 μm thick, comprises two regions, outer region intergrading with stroma, cells forming textura angularis, inner region elongate, thin-walled, hyaline cells, forming textura prismatica. Paraphyses 2–3 μm wide, persistent, aseptate, not branched, tapering towards the apex. Asci 8-spored, unitunicate, mainly uniseriate to partly biseriate, with inconspicuous ring at apex, clavate. Ascospores ellipsoidal to fusiform with rounded ends, straight or slightly curved, aseptate, hyaline, smooth walled. Asexual morph: Mycelium consisting of hyaline, septate, branched hyphae. Conidiophores either as lateral phialidic pegs or arising laterally from somatic hyphae, erect, cylindrical to subcylindrical, unbranched or rarely branched, aseptate or septate, smooth, hyaline to pale brown. Conidiogenous cells terminal, monophialidic, hyaline, smooth, elongate-ampulliform or subcylindrical, tapering towards the apex, with periclinal thickening and inconspicuous collarette. Conidia aseptate, fusiform to ellipsoidal to cylindrical, slightly or strongly curved, forming slimy heads on the conidiophore (Asexual morph description from Lombard et al. 2015).
Notes: The genus Xenoacremonium was established by Lombard et al. (2015) for a group of fungi previously known as Acremonium recifei (Gams 1971). The second species X. falcatus was introduced by Lombard et al. (2015). Members of this genus are presently known only as asexual morphs.
Type species: Xenoacremonium recifei (Leão & Lôbo) L. Lombard & Crous, in Lombard, van der Merwe, Groenewald & Crous, Stud. Mycol. 80: 235 (2015).
Other accepted species: Species Fungorum – search Xenoacremonium.
Figure 1 – Xenoacremonium brunneosporum (MFLU 16-1204, holotype). a–c Appearance of stromata on host. d Vertical section through stromata. e Peridium. f Paraphyses. g–j Immature and mature asci. k–q Ascospores. Scale bars: a, b, d = 200 μm, f–j = 50 μm, e = 20 μm, k–q = 10 μm.
References
Entry by
Monika Dayarathne, 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, World Agro forestry Centre East and Central Asia Office, 132 Lanhei Road, Kunming 650201, China, Key Laboratory for Plant Biodiversity and Biogeography of East Asia (KLPB), Kunming Institute of Botany, Chinese Academy of Science, Kunming 650201, Yunnan, China
Published online 13 January 2020