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Digitodesmium polybrachiatum sp. nov., a new species of Dictyosporiaceae from Brazil

2021; Springer Science+Business Media; Volume: 20; Issue: 9 Linguagem: Inglês

10.1007/s11557-021-01717-5

1861-8952

T. F. Nóbrega, Bruno W. Ferreira, Robert W. Barreto,

Yeasts and Rust Fungi Studies

Digitodesmium is a genus of saprobic fungi, generally associated with decaying wood in freshwater habitats or in the soil. Fungi in this genus produce cheiroid, euseptate conidia on sporodochia. During an exam of a necrotic robusta coffee stem sent from Nova Venécia, state of Espírito Santo, to the Plant Clinic at the Universidade Federal de Viçosa (Brazil), for disease diagnosis, a fungus, recognized as having the typical features of Digitodesmium, was observed. The fungus was isolated in pure culture and DNA was extracted. Sequences of the partial 18S ribosomal RNA gene, large subunit of the nrDNA, internal transcribed spacer, and translation elongation factor 1-α were generated. The combination of results of the phylogenetic analysis with the exam of the morphology led to the conclusion that the fungus from the dead coffee stems represents a monophyletic distinct lineage within Digitodesmium and an undescribed species for the genus. The concatenate tree also revealed that Digitodesmium is divided in two distinct clades. The novel species can be differentiated morphologically from other species of Digitodesmium by the size of the conidia, the number of arms, and the presence of appendages. The new species Digitodesmium polybrachiatum is hence proposed herein. A comparative table of conidial morphology for the species in the genus is also included.