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Myrothecium-like (Ascomycota, Hypocreales) species from tropical areas: Digitiseta gen. nov. and additions to Inaequalispora and Parvothecium

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Abstract

Inaequalispora and Parvothecium are two myrothecium-like, closely related genera of Hypocreales. They are also morphologically similar, sharing sporodochial conidiomata, penicillate conidiophores, fusiform to ellipsoidal conidia accumulating in a green slimy drop, and hypha-like setoid extensions emerging through the conidial mass. During a revision of myrothecium-like isolates originating from rainforest areas of South America (Ecuador, Brazil) and Southeast Asia (Singapore), multilocus phylogenetic inferences (based on DNA sequence data of ITS, partial nuc 28S, and partial tef1a, rpb2 and tub2) and morphological studies concordantly revealed the occurrence of two undescribed species of Inaequalispora (I. longiseta sp. nov. and I. cylindrospora sp. nov.) and one undescribed species of Parvothecium (P. amazonensesp. nov.). Myrothecium setiramosum, M. dimorphum, and two undescribed taxa form the base of a new lineage, sister to the current Parvothecium lineage. This lineage is recognized as Digitiseta gen. nov., typified by D. setiramosa comb. nov. Digitiseta dimorpha comb. nov. is also proposed, and the new species D. parvodigitata sp. nov. and D. multidigitata sp. nov. are described.

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Notes

  1. Digitiseta dimorpha (Ts. Watan.) Decock & Gordillo, comb. nov. (MB820832; basionym: Myrothecium dimorphum Ts. Watan.,Mycoscience 44: 284 (2003), MB489474).

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Acknowledgements

The authors gratefully acknowledge the financial support received from the CIUF/CUD (currently ARES, Académie de Recherche et d’Enseignement Supérieur Wallonie-Bruxelles, Commission de la Coopération pour le Dévelopment) through the PIC Project “Reinforcement of the fungal expertise in Ecuador via case studies of fungal plants interactions in selected ecosystems and the development of biotechnology-oriented fungal resource centers”. Ana Gordillo also acknowledges the financial support received from PUCE when working in Ecuador. The authors also thank Petro Amazonas for facilitating access to the oil-polluted ponds and laboratory facilities in the Research Center for Environmental Technologies located in Sacha camp. Strains from Singapore were obtained through cooperation with Olivier Laurence, Mycosphere S.a.r.l. Several strains from Brazil, Cuba and Venezuela were received courtesy of Dr. R.F. Castañeda, INIFAT, Cuba. The authors also warmly thank Stéphanie Huret for her help with the sequencing program.

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Authors and Affiliations

  1. Laboratorio de Micología, Pontificia Universidad Católica del Ecuador, Quito, Ecuador

    Ana Gordillo

  2. Mycothèque de l’Université catholique de Louvain (MUCL1), Earth and Life Institute, Croix du Sud 2 bte L7/05.06, 1348, Louvain-la-Neuve, Belgium

    Cony Decock

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  1. Ana Gordillo
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Correspondence to Cony Decock.

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Section Editor: Roland Kirschner

MUCL is a member of the Belgian Coordinated Collections of Microorganisms (BCCM™).

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

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Gordillo, A., Decock, C. Myrothecium-like (Ascomycota, Hypocreales) species from tropical areas: Digitiseta gen. nov. and additions to Inaequalispora and Parvothecium . Mycol Progress 17, 179–190 (2018). https://doi.org/10.1007/s11557-017-1302-4

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