Abstract

Synnemapestaloides rhododendri, the type species of the genus Synnemapestaloides, is a pathogen of Rhododendron brachycarpum. This fungus produces six-celled conidia with appendages at both end cells, and are generated by annellidic conidiogenous cells on the synnema. These conidial structures are similar to those of the genus Pestalotia. The monotypic genus Synnemapestaloides is currently classified in the family Amphisphaeriaceae solely based on conidial morphology. Here we demonstrate that Synnemapestaloides represents a distinct genus in the family Sporocadaceae (Amphisphaeriales) based on differences in the nucleotide sequences of the partial large subunit rDNA gene, the rDNA internal transcribed spacer, and the partial β-tubulin. The genus most closely related to Synnemapestaloides is Seimatosporium and the species most similar to Synnemapestaloides rhododendri is Seim. foliicola which produces short synnema-like conidiomata (sporodochia). These results demonstrate that Seim. foliicola should be transferred to Synnemapestaloides, and also demonstrate that Sporocadaceae can have synnematal in addition to pycnidial and acervular conidiomata.

Highlights

  • Pestalotioid fungi belong to genera such as Pestalotia, Pestalotiopsis, Monochaetia, and Seimatosporium, among others

  • The sequence matrix used for phylogenetic analyses contained 575 bp from internal transcribed spacer (ITS) and 542 bp from large subunit rRNA gene (LSU)

  • Pestalotioid fungi share morphological features such as the masses of annelloconidia produced from conidiogenous cells inside or on their conidiomata, which are acervuli or pycnidia

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Summary

Introduction

Pestalotioid fungi belong to genera such as Pestalotia, Pestalotiopsis, Monochaetia, and Seimatosporium, among others. These genera are characterized by septate conidia with appendages that are apical, basal, or both, which are produced from annellidic conidiogenous cells lining the upper and inner layer of acervuli and pycnidia [1,2]. Because of the presence of acervuli or pycnidia, these fungi are all considered coelomycetes.

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