Botanica Pacifica

Taxonomic novelties

Botanica Pacifica. A journal of plant science and conservation 2025. Preprint
Article first published online: 07 NOV 2025 | DOI: 10.17581/bp.2025.14215

Triseptata orientalis sp. nov. and Leptodontidium viktortsoii sp. nov., two species from the forest-tundra soils of the Magadan Region, Russia

Vadim A. Iliushin ORCID & Irina Y. Kirtsideli ORCID

Komarov Botanical Institute RAS, St. Petersburg, Russia


A novel species in genera Triseptata and Leptodontidium are described as Triseptata orientalis and Leptodontidium viktortsoii. The new species were isolated from the forest-tundra soils of the Magadan region (Russia) and is represented by ex-type strain VKM F-5014 and VKM F-5013, accordingly. To characterize the species, we used a polyphasic taxonomic approach. A description based on morphological characters is given and it is shown that the new species are morphologically different from closely related species. Partial sequences of internal transcribed spacer rDNA region (ITS1-5.8S-ITS2) and 28S rDNA (LSU) were analyzed. The partial sequence of SSU (18S rDNA) was analyzed for L. viktortsoii as well. Sequences data, macro- and micromorphological characteristics distinguish T. orientalis and L. viktortsoii from all known species in genera Triseptata and Leptodontidium.

Ильюшин В.А., Кирцидели И.Ю. Triseptata orientalis sp. nov. и Leptodontidium viktortsoii sp. nov., два новых вида из почв лесотундры Магаданской области, Россия. Новые виды микроскопических грибов, принадлежащих родам Triseptata и Leptodontidium, были описаны как Triseptata orientalis и Leptodontidium viktortsoii. Новые виды были выделены из почв лесотундры Магаданской области (Россия) и представлены штаммами VKM F-5014 и VKM F-5013, соответственно. Для характеристики видов мы использовали полифазный таксономический подход. Приведенное описание на основе морфологических признаков показывает, что новый вид морфологически отличается от близкородственных видов. Были проанализированы частичные последовательности региона ITS (ITS1-5.8S-ITS2) и 28S рДНК (LSU). Также была проанализирована частичная последовательность SSU (18S рДНК) для L. viktortsoii. Данные последовательностей, макро- и микроморфологические характеристики позволяют отличить T. orientalis и L. viktortsoii от всех других известных видов родов Triseptata и Leptodontidium.

Keywords: forest-tundra, Leptodontidium, microfungi, multi-gene phylogeny, soil fungi, Triseptata, лесотундра, Leptodontidium, микроскопические грибы, мультигенная филогения, почвенные грибы

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