Abstract
Myrothecium sensu lato includes a group of fungal saprophytes and weak pathogens with a worldwide distribution. Myrothecium s.l. includes 18 genera, such as Myrothecium, Septomyrothecium, Myxospora, all currently included in the family Stachybotryaceae. In this study, we identified 84 myrothecium-like strains isolated from turfgrasses and their rhizosphere. Five new species, i.e., Alfariapoae, Alf.humicola, Dimorphisetaacuta, D.obtusa, and Paramyrotheciumsinense, are described based on their morphological and phylogenetic distinctions. Phylogenies were inferred based on the analyses of sequences from four DNA loci (ITS, cmdA, rpb2 and tub2). The generic concept of Dimorphiseta is broadened to include a third type of seta, i.e. thin-walled, straight with obtuse apices.
Highlights
Myrothecium was first introduced by Tode (1790) based on M. inundatum
Phylogenetic analyses of above 84 strains were performed on single locus and concatenated datasets (ITS, cmdA, tub2 and rpb2), with 70 strains in Myrothecium s.l. as reference and Fusarium sambucinum (CBS 146.95) as outgroup
Among 84 myrothecium-like strains, 14 strains were identified as four known species, Albifimbria verrucaria (10 strains), Alb. terrestris (1 strain), Striaticonidium brachysporum (2 strains) and Paramyrothecium nigrum (1 strain)
Summary
Myrothecium was first introduced by Tode (1790) based on M. inundatum. The typical characters of these fungi are cup-shaped sporodochia covered by a mass of slimy, green to black conidia. Chen et al (2015) re-evaluated the phylogeny of Myrothecium based on ITS and elongation factor 1-alpha (EF1-α) gene sequences, suggesting the polyphyly of Myrothecium within Stachybotryaceae. These studies did not make taxonomic conclusions . Under the current concept of Myrothecium sensu stricto, only two species were included, M. inundatum and M. simplex (Lombard et al 2016)
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