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Octosporopsis erinacea and Octospora kelabitiana (Pezizales) – two new hepaticolous ascomycetes from Borneo

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Abstract

Two new hepaticolous ascomycetes from the Kelabit Highlands (Sarawak, Borneo) are described and illustrated. Both of them infect thallose liverworts growing in damp and shaded localities. Octosporopsis erinacea parasitizing Dumortiera hirsuta (Marchantiopsida) has tiny, light yellow, rimless, setose apothecia, usually 8-spored asci and ellipsoid ascospores. Hyphae with appressoria develop superficially on, and intracellularly within, the host thallus. Dumortiera was recorded as a host for any bryophilous fungus for the first time. Octospora kelabitiana parasitizes species of the genus Riccardia (Jungermanniopsida). It is characterised by very small, light orange, setose apothecia, 8-spored asci, ellipsoid, biguttulate spores and very thick hyphae with conspicuous warts and ridges. Generic placement of both species was inferred based on DNA analysis of two nuclear loci (EF1α, LSU rDNA).

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Acknowledgements

We thank local Kelabit guides Rian John Pasan (Pa′Umor) and David Attu (Pa′Lungan). Petr Včelička and Marcel Vega are acknowledged for providing specimens of bryophilous fungi for the phylogenetic study, Jan Eckstein for determination of host bryophytes in some species used in the phylogenetic study, Lukáš Janošík for sharing his findings in Octospora s.l. and Chris Yeates for language correction. PD thanks Franz Höck who kindly helped with the layout of the illustrations. ZE was supported by an internal grant from Palacký University (IGA_PrF_2017_001), MS by grant No. LO1204 (Sustainable development of research in the Centre of the Region Haná) from the National Program of Sustainability I, MEYS. The research was conducted under the permit No. NCCD.907.4.4(JLD.13)-337.

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Correspondence to Zuzana Egertová.

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The authors declare that they have no conflict of interest.

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This article is part of the “Special Issue on ascomycete systematics in honour of Richard P. Korf who died in August 2016”.

Section Editor: Roland Kirschner

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Egertová, Z., Döbbeler, P. & Sochor, M. Octosporopsis erinacea and Octospora kelabitiana (Pezizales) – two new hepaticolous ascomycetes from Borneo. Mycol Progress 17, 103–113 (2018). https://doi.org/10.1007/s11557-017-1354-5

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Keywords

  • Bryophilous fungi
  • Dumortiera
  • Kelabit highlands
  • Riccardia
  • Sarawak