Hysteriales » Hysteriaceae » Rhytidhysteron

Rhytidhysteron erioi

Rhytidhysteron erioi Ekanayaka & K.D. Hyde, in Hyde et al., Fungal Diversity 100: 21 (2020) Index Fungorum number: IF556788; Facesoffungi number: FoF 06460; Fig. 7

Etymology: Referring to the significant contribution Erio Camporesi made to mycology

Holotype: MFLU 16-0584


Sexual morph:. Ascomata 270–360 μm high, 600–1200 μm long, apothecial, arising singly, substipitate, superficial or slightly erumpent from the substrate. Receptacle cupulate, convex or flat, black when fresh. Disc orange when fresh, become magenta with the presence of KOH. Margins black when fresh, dentate. Ectal excipulum 55–75 μm (x̄= 63.3 μm, n = 10) composed of large, thin-walled, dark brown cells of textura angularis to textura globulosa. Medullary excipulum 14–20 μm (x̄= 17.3 μm, n = 10) composed of hyaline cells of textura porrecta. Hymenium hyaline to brownish, enclosed in a thick gelatinous matrix. Paraphyses 2–2.5 μm wide (x̄= 2.3 μm, n = 2 0) wide at the apices, numerous, filiform, septate, slightly branched at the base, slightly swollen at the apices, apices glued together to develop pseudo-epithecium, gelatinous material include yellowish to brownish pigments which turns magenta in KOH. Asci 140–200 × 9–16 μm (x̄= 184.3 × 14.5 μm, n = 30) 8-spored, bitunicate, short

pedicellate, cylindrical, rounded at the apex, J-. Ascospores 22–28 × 9–11 μm (x̄= 27.1 × 10.3 μm, n = 40), 1-seriate, ellipsoid, hyaline to light brown, aseptate, with wrinkled walls when young, dark brown, 3-septate, smooth- and thick-walled, with guttulate. Asexual morph: Undetermined.




Material examined: THAILAND, Chiang Rai Province, Doi Pui, on unidentified decaying wood, 19 June 2015, A.H. Ekanayaka, HD 022 (MFLU 16-0584, holotype).


GenBank Accession No: ITS: MN429068, LSU: MN429071, SSU: -, TEF1: MN442086.


Notes: Rhytidhysteron erioi is characterised by substipitate apothecia, paraphyses with slightly swollen apices without pigments and 3-septate ascospores. In the comparison of ITS data, our new strain shows 95% (466/492 bp) similarity to R. rufulum (MFLUCC 12-0568) and R. mangrovei MFLUCC 18-1113) and 94% (461/492 bp) similarity to R. neorufulum (MFLUCC 13-0221), but differs in 26 base pairs including four gaps, 22 base pairs including five gaps and 31 base pairs including five gaps. Our strain is phylogenetically close to R. hysterinum (Dufour) Samuels & E. Müll. and R. thailandicum. However, R. hysterinum differs from our species in having 1-septate ascospores (Samuels and Müller 1979). Rhytidhysteron thailandicum differs in having yellowish to brown ascospores with smooth walls when both mature and immature (Thambugala et al. 2016). Rhytidhysteron mangrovei differs in having smaller asci (110–150 × 9.4–10 μm) and not having wrinkled ascospores at a young stage (Kumar et al. 2019).


Figure 11. Rhytidhysteron erioi (MFLU 16-0584, holotype). a Substrate. b, c Ascomata on wood. d Cross section of an ascoma (mounted in KOH). e Close up of a vertical section of the ascoma at margin. f Septate paraphyses. g–j Cylindric-clavate asci. k–n Ellipsoid ascospores. Scale bars: b, c = 500 μm, d = 200 μm, e = 100 μm, f = 75 μm, g–j = 40 μm, k–n = 10 μm



Hyde KD, Dong Y, Phookamsak R, Jeewon R et al. (2020) Fungal diversity notes 1151–1276: taxonomic and phylogenetic contributions on genera and species of fungal taxa. Fungal Divers 100:5–277.


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project entitled:

"The future of specialist fungi in a changing climate: baseline data for generalist and specialist fungi associated with ants Rhododendron species and Dracaena species"

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"Impact of climate change on fungal diversity and biogeography in the Greater Mekong Sub-region"

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  • Honghe County 654400, Yunnan, China

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