In: Sydowia 78, (2025): 135-143; ISSN 0082-0598, DOI 10.12905/0380.sydowia78-2026-0135, Published online on November 17th 2025

Dictydiaethalium diminutum (Dictydiaethaliaceae, Trichiales): a new species of myxomycetes from Brazil based on morphological and phylogenetic evidence

Lucca de Araujo Toschi*, Lucas Leonardo-Silva & Solange Xavier-Santos

Laboratory of Basic, Applied Mycology and Scientific Dissemination (FungiLab), State University of Goiás, BR-153 3105
Fazenda Barreiro do Meio, 75132-903 Anápolis, Goiás, Brazil

* e-mail: lucca.toschi.bio@gmail.com

Toschi L.A, Leonard-Silva L. & Xavier-Santos S. (2025) Dictydiaethalium diminutum (Dictydiaethaliaceae, Trichiales): a new species of myxomycetes from Brazil based on morphological and phylogenetic evidence. – Sydowia 78: 135–143.

Dictydiaethalium is a genus of myxomycetes with several features that pose interesting taxonomic questions, such as the similarities among species and the problem of few collection records. During a sensu lato mycological expedition to a Brazilian savanna area, sporocarps of a new species were collected. Herein we describe it as Dictydiaethalium diminutum, based on genetic data from the 18S rRNA and mtSSU regions, as well as morphological comparisons with other species of the genus.

Keywords: 18S, mtSSU, myxomycetes, Neotropics, taxonomy, new species.