Description of Allocanariomyces and Parachaetomium , two new genera, and Achaetomium aegilopis sp. nov. in the Chaetomia
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ORIGINAL ARTICLE
Description of Allocanariomyces and Parachaetomium, two new genera, and Achaetomium aegilopis sp. nov. in the Chaetomiaceae Mehdi Mehrabi 1
&
Bita Asgari 1 & Rasoul Zare 1
Received: 7 July 2020 / Revised: 28 September 2020 / Accepted: 5 October 2020 # German Mycological Society and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract We describe Allocanariomyces tritici gen et sp. nov. and Achaetomium aegilopis sp. nov. as seed endophytes of Triticum boeoticum and Aegilops triuncialis, respectively, in the west and northwestern Iran using morphological traits and sequences of the internal transcribed spacer regions 1 and 2 including the intervening 5.8S nuclear ribosomal DNA (ITS), partial nuclear 28S ribosomal DNA (LSU), β-tubulin (TUB2), and the second-largest subunit of DNA-directed RNA polymerase II (RPB2) gene. Chaetomium carinthiacum, C. iranianum, and C. truncatulum are also combined here under the new genus, Parachaetomium. Allocanariomyces is differentiated from Canariomyces, its closest relative, by having solitary and glabrous ascomata, cells of the perithecial wall forming a textura epidermoidea, stalked asci, densely granular ascospores with a distinct subapical germ pore, and producing only solitary conidia. Parachaetomium is characterized by distinctly ostiolate ascomata and equi- or inequilaterally fusiform, typically less than 13-μm-long ascospores with an oblique or subapical germ pore. Achaetomium aegilopis is mainly distinguished from A. strumarium, its closest relative, by possessing brown, ascomata, hyaline ascomatal hairs covered with hyaline crystals, hyaline chlamydospores, and lacking an anamorph. Keywords Ascomycetes . Endophytic fungi . 2 new genera . 2 new species . New combinations . Phylogeny . Sordariales . Taxonomy
Introduction The family Chaetomiaceae was introduced by Winter (1885), as Chaetomiea, with Chaetomium Kunze as the type genus. Members of this family occur worldwide and live as saprobes on various substrates including dung, seeds, paper, plant debris, soil, air, and wood (Wang et al. 2016a, b). Endophytic, parasitic (Violi et al. 2007), and mycoparasitic (Marin-Felix et al. 2015) representatives have also been reported. Furthermore, some species have been found as human
Section Editor: Hans-Josef Schroers Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11557-020-01636-x) contains supplementary material, which is available to authorized users. * Mehdi Mehrabi [email protected] 1
Department of Botany, Iranian Research Institute of Plant Protection, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran
opportunistic pathogens (Abbott et al. 1995; de Hoog et al. 2013; Ahmed et al. 2016). The family Chaetomiaceae is mainly characterized by ostiolate or non-ostiolate, solitary to gregarious, superficial or immersed perithecia that are mostly covered with hair/ setae or, rarely, glabrous; clavate to cylindrical, pedicellate, 4–8-spored, unitunicate, evanescent as
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