Fungalpedia – Note 1072, Chaetopsina
Chaetopsina Rambelli
Citation when using this data: Dayarathne MC et al. 2020 – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig 1
Classification: Nectriaceae, Hypocreales, Hypocreomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Fungi
Chaetopsina is a dematiaceous hyphomycete which was introduced by Rambelli (1956) to 102 include C. fulva and this genus remained monotypic for 25 years. Later Matsushima (1971) introduced C. ramifera. Later, several other species have been added by Sutton & Hodges (1976), Rambelli & Lunghini (1976, 1979), Morgan-Jones (1979), Crane & Schoknecht (1982), Kirk & Sutton (1985), Kirk & Sutton (1985), Samuels (1985), Wingfield (1987), Merli et al (1992), Zucconi & Rambelli (1993), and Holubova-Jechova (1990). Hence, currently the genus comprises 19 species. Chaetopsina is characterized by mononematous, erect, septate, pigmented, setiform, apically sterile conidiophores (Rambelli 1956). The conidiogenous cells are discrete, ampulliform or lageniform, phialidic, and produce unicellular, hyaline, smooth conidia, which are aggregated in slimy masses (Ellis 1971). Samuels (1985) proposed that Chaetopsina should be restricted to asexual morphs of Nectria sensu lato with reddish-brown setose conidiophores that turn yellow in lactic acid. This was accepted by Kirk & Sutton (1985), who further restricted Chaetopsina to species with unicellular, fusiform, smooth-walled conidia, and fertile regions situated terminally or along the axes of the setiform conidiophores. Based on these amended generic concepts, only five species were accepted in the genus by Kirk & Sutton (1985). Only six Chaetopsina species have sequence data in GenBank (2019 June).
Type species: Chaetopsina fulva Rambelli, Diagn. IV 3: 5 (1956).
Other accepted species: Species Fungorum – search Chaetopsina.
Figure 1 – Chaetopsina aurantisalinicola (MFLU 18-0566, holotype). a–c Colonies on substrate. d Conidiophores bearing conidia. e, f Conidia attached to the conidiogenus cells. g–j Conidia. k Germinating conidium. i Culture on sea water PDA (upper). Scale bars: a, d = 100 μm, e, f = 50 μm, j–k = 10 μm.
References
Ellis MB. 1971 – Dematiaceous Hyphomycetes. Commonwealth Mycological Institute, Kew, Surrey, England, pp 608.
Holubova-Jechova V. 1990 – Problems in the taxonomy of the dematiaceous Hyphomycetes. Studies in Mycology 32, 41–48.
Matsushima T. 1971 – Microfungi of the Solomon Islands and Papua-New Guinea. Nippon Printing & Publishing, Osaka.
Rambelli A. 1956 – Chaetopsina nuovo genere di Ifali Demaziacei. Journal of agricultural research III 191–196.
Samuels GJ. 1985 – Four new species of Nectria and their Chaetopsina anamorphs. Mycotaxon 22, 13–32.
Sutton BC, Hodges Jr CS. 1976 – Eucalyptus microfungi, Mycoleptodiscus species and Pseudotracylla gen. nov. [Brazil]. Nova Hedwigia 27, 693–700.
Wingfield MJ. 1987 – A new name for Phialocephala illini. Mycotaxon USA.
Zucconi L, Rambelli A. 1993 – A new species of Chaetopsina from tropical forest litter. Mycotaxon 48, 5–12.
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 17 November 2025