| Cortinarius subsaniosus | |
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| Type specimen | |
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| Spores | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Fungi |
| Division: | Basidiomycota |
| Class: | Agaricomycetes |
| Order: | Agaricales |
| Family: | Cortinariaceae |
| Genus: | Cortinarius |
| Species: | C. subsaniosus
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| Binomial name | |
| Cortinarius subsaniosus Liimat. & Niskanen (2020)
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Cortinarius subsaniosus is a species of webcap mushroom known from north and central Europe, where it grows on sandy soil in association with willows. It produces small yellowish brown mushrooms. The species was described in 2020 by Kare Liimatainen and Tuula Niskanen. Its name refers to its affinity to C. saniosus, to which it is closely related. Along with five other British webcaps, C. subsaniosus was selected by Kew Gardens as a highlight of taxa described by the organisation's staff and affiliates in 2020.