Pleosporales » Melanommataceae » Camposporium

Camposporium septatum

Camposporium septatum N.G. Liu, J.K. Liu & K.D. Hyde
Index Fungorum number: IF 557182; Facesoffungi number: FoF 06711

Etymology: Name reflects the septate conidia

Holotype: MFLU 19-2851

 

Saprobic on submerged decaying wood in a freshwater. Sexual morph: Undetermined. Asexual morph: Hyphomycetous. Colonies on natural substrate, effuse, golden brown, velvety. Mycelium mostly immersed, composed of white, septate, branched and guttulate hyphae. Conidiophores macronematous, mononematous, often procumbent on substrate, pale brown to median brown, unbranched, irregularly cylindrical, flexuous, septate, thick-walled. Conidiogenous cells monoblastic, terminal, integrated, subcylindrical, pale brown. Conidia 98–125 μm (x̄ = 110 μm, n = 30) long, 7–11.5 μm (x̄ = 9 μm, n = 30) wide at middle, 3.5–6 μm (x̄ = 4.5 μm, n = 30) wide at base, solitary, dry, cylindrical, elongate, median brown, paler at base, finely verrucose, (8–)9(–11)-septate, not constricted or slightly constricted at the septa, apex rounded, basal cell truncate, the apical cell gives rise to (2–)3 simple appendages; appendage hyaline, aseptate, smooth, tapering from the base to the apex. (Description from Hyde et al. 2020)

 

Culture characteristics: Conidia germinating on water agar within 24 h. Germ tubes produced from the basal cell of conidia. Mycelia superficial, irregularly circular, with entire edge, from above yellowish gray in the centre, gray at the edge.

 

Material examined: THAILAND, Chiang Rai Province, Muang, Ban Nang Lae Nai, on decaying wood submerged in a freshwater stream, 6 March 2018, N.G. Liu, CR089 (MFLU 19-2851, holotype), ex-type living culture, MFLUCC 19-0483.

 

GenBank numbers: ITS = MN758892, LSU = MN759023, SSU = MN758958, TEF1-α = MN784096.

 

Notes: Camposporium septatum resembles C. fusisporum Whitton, McKenzie & K.D. Hyde in conidial length (98–125 versus 86–115 μm) and number of septa ((8–)9(–11) versus 8–11). Moreover, these two species have 2–3 apical appendages. However, the conidia of C. fusisporum are much wider than those of C. septatum (13.5–19 versus 7–11.5 μm) (Whitton et al. 2002). Phylogenetic analyses of a combined LSU, SSU, ITS and TEF1-α sequence dataset showed that C. septatum forms a distinct lineage basal to Fusiconidium with high support (91% ML, 1.00 BYPP). However, Camposporium septatum is morphologically different from Fusiconidium in conidiogenesis and conidial shape (Li et al. 2017) but fits well to Camposporium. Therefore, we introduce our new species as C. septatum. (Notes from Hyde et al. 2020)