Kirchsteiniothelia submersa H.Y. Su & K.D. Hyde
Index Fungorum number: IF551837; Facesoffungi number: FoF 01739
Etymology: In reference to the submerged habitat.
Holotype: HKAS 83992
Saprobic on decaying wood. Sexual morph: Undetermined. Asexual morph: Colonies effuse, brown or black, hairy. Mycelium mostly immersed. Stroma none. Setae and hyphopodia absent. Conidiophores macronematous, mononematous, blackish to brown, paler towards the apex, smooth, unbranched, thick-walled, multi-septate, straight to slightly flexuous, cylindrical, erect, 220–280 μm (x̄ = 248 μm, SD = 29, n = 10) long, 6–7 μm (x̄ = 6.5 μm, SD = 0.5, n = 10) wide. Conidiogenous cells holoblastic, integrated, terminal, determinate, percurrent, pale brown, cylindrical. Conidia acrogenous, solitary, dry, smooth, obclavate, straight or slightly curved, truncate and darker at the base, rounded and paler at the apex, brown to pale brown, thick-walled, hyaline and thinner at the tip, 4–6-septate, 37.5–51.5 μm (x̄ = 44.5 μm, SD = 7, n = 20) long, 8.5–9.5 μm (x̄ = 9 μm, SD = 0.5, n = 20) wide. Conidial secession schizolytic. (Descriptions from Su et al. 2016)
Material examined: CHINA, Yunnan Province, Dali, on decaying wood submerged in Wanhua Stream, March 2014, Xiao-Ying Liu, S-043 (HKAS 93066, holotype), ex-type culture, MFLUCC 15–0427, KUMCC; ibid. (DLU-043, isotype).
Notes: Kirchsteiniothelia submersa is introduced by Su et al. (2016) based on both morphology and molecular data. Kirchsteiniothelia submersa forms a distinct clade within the family Kirschsteiniotheliaceae and is sister to K. thujina (JF13210). Kirchsteiniothelia submersa is compatible with the generic concept of Kirchsteiniothelia in having dark, thick-walled, septate conidiophores, which arise singly from the woody substratum, and thick-walled, septate conidia. It differs from other species in the genus in having unbranched, thinner conidiophores which are straight or slightly curved, truncate at the base, rounded at the apex, brown to pale brown, and multi-septate, and in having smaller conidia. (Notes from Su et al. 2016)
Su HY, Hyde KD, Maharachchikumbura SSN, et al (2016) The families Distoseptisporaceae fam. nov., Kirschsteiniotheliaceae, Sporormiaceae and Torulaceae, with new species from freshwater in Yunnan Province, China. Fungal Divers 80:. https://doi.org/10.1007/s13225-016-0362-0
Fig 1. Kirchsteiniothelia submersa (HKAS 83992, holotype). a-d. Conidiophores with conidia. e-j. Conidia. k. Germinating conidium. l, m. Culture on PDA, l. from above, m. from below. Scale bars: a, b = 100 μm, c, d, k = 30 μm, e-j = 20 μm (Su et al. 2016)