Viljandia Tedersoo, 2025

Tedersoo, Leho, Hosseyni Moghadam, Mahdieh S., Panksep, Kristel, Prins, Victoria, Anslan, Sten, Mikryukov, Vladimir, Bahram, Mohammad, Abarenkov, Kessy, Kõljalg, Urmas, Esmaeilzadeh-Salestani, Keyvan, Pawłowska, Julia, Wurzbacher, Christian, Ding, Yi, Alkahtani, Saad Hussin & Nilsson, R. Henrik, 2025, Thirty novel fungal lineages: formal description based on environmental samples and DNA, MycoKeys 124, pp. 1-121 : 1-121

Viljandia Tedersoo gen. nov.

Type species.

Viljandia globalis Tedersoo .

Diagnosis.

Distinguishable from other species of Viljandiaceae based on diagnostic nucleotide signatures in SSU V 9 (positions 1695–1709 in S. cerevisiae ggcttccggcagcca; one mismatch allowed) and 5.8S (positions 126–135 in the type species and 126–134 in S. cerevisiae cactctaagg; one mismatch allowed). Forms a monophyletic, least inclusive clade in Viljandiaceae, covering sequences EUK 1105441 , EUK 1124341 , and EUK 1124345 (Figs 1 , 57 ).

Notes.

Recognized based on eDNA sequences only. Currently comprises Viljandia globalis (sp. nov.).

Figures

Figure 1. Maximum Likelihood SSU- 5.8 S-LSU phylogram indicating placement of novel lineages in the fungal kingdom as highlighted in a coloured shade and red font. Previously described taxonomic clades are collapsed. All branches of Sumavosporidiomycetes and Gelotisporidiomycetes are shortened two-fold. Poorly supported branches with bootstrap values below 95 % / 99 % are indicated in blue. The original tree with bootstrap values and uncollapsed branches is indicated in Suppl. material 1.

Figure 57. Maximum Likelihood SSU- ITS - LSU phylogram indicating the position of Viljandia globalis within Viljandiomycota, with ultra-rapid bootstrap values indicated (for higher-level classifications only). Other genus-level groups are collapsed. Kickxellomycota spp. were used as an outgroup.