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Issue: Vol. 732 No. 1: 3 Dec. 2025
Type: Article
Published: 2025-12-03
DOI: 10.11646/phytotaxa.732.1.2
Page range: 21-34
Abstract views: 90
PDF downloaded: 2

A new family of freshwater ascomycetes from Australia: Rivulataceae fam. nov., Rivulatus australiensis gen. et. sp. nov. (Diaporthomycetidae)

College of Science and Engineering, Flinders University, G.P.O. Box 2100, Adelaide SA 5001, Australia; IUCN SSC Aquatic Fungi Specialist Group, IUCN Species Survival Commission, Rue Mauverney 28, 1196 Gland, Switzerland
College of Science and Engineering, Flinders University, G.P.O. Box 2100, Adelaide SA 5001, Australia
Diaporthomycetidae Sorariomycetes Ascomycota freshwater fungi new genus 3 new taxa Fungi

Abstract

While surveying freshwater fungi on submerged wood in Australian rivers, lakes and streams, a new ascomycete species was collected and described. Maximum likelihood and Bayesian analyses indicate that Rivulatus australiensis is a new species, representing a new genus, Rivulatus and a new family, Rivulataceae, family incertae sedis, within the subclass Diaporthomycetidae. Although morphologically similar to Atractosporaceae, Rivulatus australiensis can be distinguished from this family by the black, carbonaceous ascomata and the shape of the ascus apical apparatus. Descriptions and illustrations of the new taxa are provided, along with comparisons with closely related taxa.

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How to Cite

Fryar, S.C. & Catcheside, D.E. (2025) A new family of freshwater ascomycetes from Australia: Rivulataceae fam. nov., Rivulatus australiensis gen. et. sp. nov. (Diaporthomycetidae). Phytotaxa 732 (1): 21–34. https://doi.org/10.11646/phytotaxa.732.1.2