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.
Highlights
The family Chaetomiaceae was introduced by Winter (1885), as Chaetomiea, with Chaetomium Kunze as the type genus
The sequences generated in this study were aligned against sequences of members of the Chaetomiaceae, mostly from Wang et al (2016a, 2019a, b) and Asgari and Zare (2011) (Table 1)
The four datasets were combined in a single analysis, with Microascus trigonosporus (CBS 218.31) and Berkeleyomyces basicola (CBS 341.33), as outgroups (Wang et al 2019b)
Summary
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). The family Chaetomiaceae is mainly characterized by perithecia ostiolate or non-ostiolate, solitary to gregarious, superficial or immersed, mostly covered with hair/setae, rarely glabrous; asci clavate to cylindrical, pedicellate, 4–8spored, unitunicate, evanescent; ascospores brown to black, and opaque when mature, ellipsoidal, globose, subglobose, oval, fusiform or triangular, aseptate, with thick, smooth walls, and single or sometimes two germ pores (Maharachchikumbura et al 2016). Several asexual morphs are linked to the Chaetomiaceae, including acremonium-like, botryotrichum-like, chrysonilia-like, chrysosporium-like, humicola-like, myceliophthora-like, scytalidium-like and trichocladium-like (Asgari and Zare 2011; Cannon 1986; Wang et al 2016a, b; 2019a, b)
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