Tricholoma ustale
| Tricholoma ustale | |
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| Scientific classification | |
| Kingdom: | Fungi |
| Division: | Basidiomycota |
| Class: | Agaricomycetes |
| Order: | Agaricales |
| Family: | Tricholomataceae |
| Genus: | Tricholoma |
| Species: | T. ustale |
| Binomial name | |
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Tricholoma ustale (Fr.) P.Kumm. (1871) |
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| Synonyms | |
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Tricholoma ustale, commonly known as the burnt knight, is a species of mushroom in the large genus Tricholoma. It is found in Asia, Europe, and North America, though those from North America may represent one or more different species.
Elias Magnus Fries described the fungus in 1818 as Agaricus ustalis.Paul Kummer gave it its current name in 1871 upon transferring it to the genus Tricholoma.Lucien Quélet's Gyrodon ustale, published in 1886, is a synonym.Marcel Bon described the variety rufoaurantiacum from France in 1984. Within the genus Tricholoma, T. ustale is classified in the section Albobrunnea of the subgenus Tricholoma.
The species name is from the Latin ustalis "burnt" and relates to the colour of the mushroom. It is commonly known as the "burnt knight". In Japan, the mushroom is known as Kakishimeji (Kaki-shimeji).
The mushroom has a bell-shape to conical or convex cap that measures 3–10 cm (1.2–3.9 in) in diameter and is orange-red-brown. The cap margin is initially curled inward, but straightens in age as the edge become lobed wavy. The gills are somewhat crowded together, and have an adnate to attachment to the stem. They are cream to pale yellow when young, aging to pale brown with brown spots. The cylindrical stem, which measures 3–9 cm (1.2–3.5 in) long by 1–2.5 cm (0.4–1.0 in) thick, is somewhat thicker at the base. The flesh is white but turns brown where it is bruised or otherwise injured. The roughly spherical to ellipsoid spores are typically 6.0–7.5 by 5.0–6.0 µm, and feature a hilum.
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