Botanica Pacifica. A journal of plant science and conservation 2026. Preprint
Article first published online: 09 MAY 2026 | DOI: 10.17581/bp.2026.15201
Fungi Seifertia sikhotensis – a new species, and Synnemapestaloides rhododendri – a new record for Russia, causing blight disease of Rhododendron brachycarpum subsp. fauriei in the Central Sikhote-Alin
Vera F. Malysheva 1
,
Vasily A. Dudka 1,
Ekaterina F. Malysheva 1 &
Svetlana N. Bondarchuk 2 1 Komarov Botanical Institute RAS, Saint-Petersburg, Russia
2 Sikhote-Alin State Nature Biosphere Reserve named after K.G. Abramov, Terney, Primorsky Krai, Russia
A new species of the synnematous fungus, Seifertia sikhotensis (Melanommataceae, Dothideomycetes), was described based on morphological data and multilocus sequence analysis (ITS+LSU+tef1-α). This study also provides the first record of Synnemapestaloides rhododendri (Sporocadaceae, Sordariomycetes) in Russia. Both species were found infecting Rhododendron brachycarpum subsp. fauriei in its native continental populations located in the Sikhote-Alin Mountain Range (Primorsky Krai, Russia). The fungi form black synnemata with capitate apexes, causing necrotic brown or greyish lesions on leaves, flower buds and twigs of R. brachycarpum subsp. fauriei. Detailed morphological descriptions of the studied fungal collections are provided and accompanied by the illustrations of microstructures, phylogenetic tree, and comparisons with related species. The specimens and data generated here are important for future studies into the evolution, the distribution patterns and ecological role of Seifertia spp. and other synnematous fungi on wild rhododendrons in Russia.
Малышева В.Ф.*, Дудка В.А., Малышева Е.Ф., Бондарчук С.Н. Грибы Seifertia sikhotensis – новый вид, и Synnemapestaloides rhododendri – новая находка в России, вызывающие увядание Rhododendron brachycarpum subsp. fauriei в центральном Сихоте-Алине. В статье описан новый для науки вид Seifertia sikhotensis (Melanommataceae, Dothideomycetes), на основании морфологического и филогенетического (ITS+LSU+tef1-α) анализов. Также приводятся сведения о первой находке Synnemapestaloides rhododendri (Sporocadaceae, Sordariomycetes) в России. Оба вида поражают Rhododendron brachycarpum subsp. fauriei и были обнаружены в его природных континентальных популяциях на территории Сихоте-Алиня (Приморский край, Россия). Грибы образуют черные синнемы с головками на вершине, вызывающие некротические коричневые или сероватые поражения на листьях, цветочных почках и ветвях R. brachycarpum subsp. fauriei. В статье приведены подробные морфологические описания изученных коллекций грибов, сопровождаемые иллюстрациями микроструктур, филогенетическим деревом и сравнениями с родственными видами. Полученные здесь образцы и данные важны для будущих исследований эволюции, закономерностей распространения и экологической роли видов Seifertia и других паразитических грибов на дикорастущих рододендронах в России.
Keywords: Ascomycota, taxonomy, diversity, phylogeny, Primorsky Krai, Russian Far East, таксономия, разнообразие, филогения, Приморский край, Российский Дальний Восток
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