Viljandiales 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

Viljandiales Tedersoo ord. nov.

Type family.

Viljandiaceae Tedersoo .

Diagnosis.

Distinguishable from other fungi based on a diagnostic nucleotide signature in LSU D 2 (positions 464–478 in type species and 490–504 in S. cerevisiae ctggccaacatcagt, one mismatch allowed). Forms a monophyletic, least inclusive clade in Viljandiomycetes, covering sequences EUK 1699905 , EUK 1104555 , EUK 1124343 , EUK 1124346 , EUK 1104962 , EUK 1124344 , EUK 1202387 , EUK 1100361 , EUK 1201679 , EUK 1105441 , EUK 1124341 , and EUK 1124345 (Fig. 1 ).

Notes.

Recognized based on eDNA sequences only. Currently includes Viljandiaceae (fam. nov.) and several potentially family-level taxa represented by sequences EUK 1699905 (forest soil in Ethiopia), EUK 1104555 (forest soil in Sweden), EUK 1124343 (wasteland soil in Estonia), EUK 1124346 (urban soil in Estonia), EUK 1104962 (forest soil in Puerto Rico), EUK 1124344 (urban soil in Estonia), EUK 1202387 (tundra soil in Finland), EUK 1100361 (lake water in Sweden), and EUK 1201679 (forest soil in Sweden).

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.