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Issue: Vol. 726 No. 2: 30 Oct. 2025
Type: Article
Published: 2025-10-30
DOI: 10.11646/phytotaxa.726.2.3
Page range: 85-94
Abstract views: 247
PDF downloaded: 173

Entyloma ratibidae (Entylomataceae), a new smut fungus on Ratibida pinnata (Asteraceae) from USA based on molecular analyses, comparative morphology, and host specificity

Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, 2 Gagarin St., 1113 Sofia, Bulgaria, IUCN SSC Rusts and Smuts Specialist Group, Sofia, Bulgaria
Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, 2 Gagarin St., 1113 Sofia, Bulgaria, IUCN SSC Rusts and Smuts Specialist Group, Sofia, Bulgaria
IUCN SSC Rusts and Smuts Specialist Group, Sofia, Bulgaria, Universität Hamburg, Institute of Plant Science and Microbiology, Organismic Botany and Mycology, Ohnhorststraße 18, 22609 Hamburg, Germany
Fungi Entyloma Iowa tallgrass prairies new species phylogeny Ratibida columnifera Rudbeckia smut fungi taxonomy

Abstract

Entyloma species are highly specialized smut fungi. To clarify the taxonomic status of the Entyloma species on Ratibida pinnata from USA, we conducted a molecular study based on ITS and LSU rDNA sequences. The phylogenetic analyses indicate that this species differs from the Entyloma species with available molecular data. Based on molecular and morphological evidence, and host specialization, a new species, Entyloma ratibidae, is described and illustrated. Entyloma ratibidae differs from E. davisii on Rudbeckia hirta by having smaller spores and thinner spore walls, from E. anceps on Rudbeckia laciniata by having thicker spore walls, and from the other Entyloma species by specialization on Ratibida pinnata. The phylogenetic placement and affinities of the new species in Entyloma are analyzed. Additional collections and molecular study are required to clarify the taxonomic status of ‘Entyloma polysporum’ on Ratibida columnifera from USA.

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How to Cite

Denchev, T.T., Denchev, C.M. & Kemler, M.. (2025) Entyloma ratibidae (Entylomataceae), a new smut fungus on Ratibida pinnata (Asteraceae) from USA based on molecular analyses, comparative morphology, and host specificity. Phytotaxa 726 (2): 85–94. https://doi.org/10.11646/phytotaxa.726.2.3