Chloridium submersum
Chloridium submersum Z.L. Luo, K.D. Hyde & H.Y. Su, in Hyde et al., Mycosphere 11(1): 502 (2020)
Index Fungorum number: IF 556752
Holotype – MFLU 18-1609
Saprobic on submerged decaying wood. Asexual morph: Colonies effuse, brown, with long hairy mycelium, with white glistening conidial mass. Mycelium partly immersed, partly superficial, consisting of branched, septate, brown hyphae. Conidiophores 116–264(–350) μm (x̅ = 190 μm, SD = 74, n = 10) long, 4–6 μm (x̅ = 5 μm, SD = 1, n = 10) wide, macronematous, mononematous, erect, straight or slightly flexuous, septate, brown at the base, gradually becoming paler towards apex, smooth. Conidiogenous cells integrated, terminal, polyenteroblastic, with a conspicuous outer collarette, hyaline. Conidia 3.5–4.5 μm (x̅ = 4 μm, SD = 0.5, n = 30) long, 2–3 μm (x̅ = 2.5 μm, SD = 0.5, n = 30) wide, acrogenous, aggregated in slimy mass at the apex of the conidiophore, ellipsoid, hyaline, aseptate, guttulate, smooth. Sexual morph: Undetermined (Hyde et al. 2020).
GenBank numbers: ITS: MN860551, LSU: MN860556.
Notes: Chloridium submersum resembles C. phaeosporum in having macronematous, mononematous, erect, septate conidiophores which are brown at the base, gradually becoming paler towards apex, terminal, hyaline conidiogenous cells and ellipsoid, hyaline, aseptate conidia (Wu & Zhang 2013, Hyde et al. 2020). However, C. submersum differs from C. phaeosporum by its longer conidiophores (116–264(–350) vs 70–120 μm), polyblastic, denticulate conidiogenous cells and guttulate, hyaline conidia, while the latter species have monophialidic conidiogenous cells constricting abruptly and expanding in a flaring collarette and pale brown conidia without guttules. Chloridium submersum is phylogenetically related to C. aquaticum, C. gonythichii and C. aseptatum (Hyde et al. 2020).
Chloridium submersum (Material examined – CHINA, Yunnan Province, saprobic on decaying submerged wood in Dulong river, May 2015, H.Y. Su, H D5-13-1, S-510, MFLU 18-1609, holotype). a Colonies on wood. b–d Conidiophores with conidia. e, f Conidiogenous cells. g–k Conidia. l, m Germinating conidia. n, o Culture on PDA from surface and reverse. Scale bars: b–d = 100 μm, e, f = 30 μm, g = 10 μm, h-m = 5 μm (image from Hyde et al. 2020).
References:
Hyde KD, Norphanphoun C, Maharachchikumbura SSN, Bhat DJ et al. 2020 – Refined families of Sordariomycetes. Mycosphere 11, 305–1059
Luo ZL, Hyde KD, Liu JK, Maharachchikumbura SSN et al. 2019 – Freshwater Sordariomycetes. Fungal Diversity 99, 451–660
Wu YM, Zhang TY. 2013 – A new species and new record of Chloridium from the Qinghai-Tibet Plateau Area, China. Mycotaxon 123, 277–280
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