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Rødbrun flathatt, Rhodocollybia butyracea butyracea, common name Buttery Collybia,a species of fungus in the mushroom family Marasmiaceae. The cap of this mushroom is 2-10 cm across. It is convex and becomes broadly convex or almost flat. When fresh, this species is smooth and moist. It has a reddish-brown colour fading to cinnamon.
The gills are either free from the stem, or narrowly attached. They range from close to crowded and are whitish. Occasionally, they develop a pinkish tone as they age, and often form fine, jagged edges.
The stem is up to 10 cm long and 1 cm thick. It is normally somewhat club-shaped. It can either be moist or dry
The flesh of this species is white. There is no distinctive odor or taste.
The spores are pale yellowish, pale pinkish, or white. Rhodocollybia butyracea is a widespread decomposer of conifer debris, usually found under pines (species of Pinus, with bundled needles). It is very similar to Gymnopus dryophilus, but it tends to have a reddish brown, rather than yellow-brown, cap. Additionally, its stem is frequently somewhat club-shaped and its gills are often finely jagged--features not usually found in the straight-stemmed, even-gilled Gymnopus dryophilus. Some sources emphasize a difference in spore print color (pinkish for Rhodocollybia butyracea; white for Gymnopus dryophilus), but the difference, which is minimal at best, requires a very thick spore print, natural lighting, and good eyes. The best means of separating the two species is microscopic; Rhodocollybia butyracea features dextrinoid, rather than inamyloid, spores. Cap: 2–6 cm across; convex, becoming broadly convex or nearly flat; moist, with a greasy feel, when fresh; bald; reddish brown to brown, fading to cinnamon.
Gills: Narrowly attached to the stem or nearly free from it; close; short-gills frequent; whitish; often developing finely jagged edges.
Stem: 3–8 cm long; and 1–2 cm thick; usually slightly to moderately club-shaped; moist or dry; bald; whiti

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flathatt_rhodocollybia_butyracea_-2.jpg
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Bente Haarstad
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Contained in galleries
Skivesopp - Gilled mushrooms
Rødbrun flathatt, Rhodocollybia butyracea butyracea, common name Buttery Collybia,a species of fungus in the mushroom family Marasmiaceae. The cap of this mushroom is 2-10 cm across. It is convex and becomes broadly convex or almost flat. When fresh, this species is smooth and moist. It has a reddish-brown colour fading to cinnamon.<br /> The gills are either free from the stem, or narrowly attached. They range from close to crowded and are whitish. Occasionally, they develop a pinkish tone as they age, and often form fine, jagged edges. <br /> The stem is up to 10 cm long and 1 cm thick. It is normally somewhat club-shaped. It can either be moist or dry <br /> The flesh of this species is white. There is no distinctive odor or taste. <br /> The spores are pale yellowish, pale pinkish, or white. Rhodocollybia butyracea is a widespread decomposer of conifer debris, usually found under pines (species of Pinus, with bundled needles). It is very similar to Gymnopus dryophilus, but it tends to have a reddish brown, rather than yellow-brown, cap. Additionally, its stem is frequently somewhat club-shaped and its gills are often finely jagged--features not usually found in the straight-stemmed, even-gilled Gymnopus dryophilus. Some sources emphasize a difference in spore print color (pinkish for Rhodocollybia butyracea; white for Gymnopus dryophilus), but the difference, which is minimal at best, requires a very thick spore print, natural lighting, and good eyes. The best means of separating the two species is microscopic; Rhodocollybia butyracea features dextrinoid, rather than inamyloid, spores. Cap: 2–6 cm across; convex, becoming broadly convex or nearly flat; moist, with a greasy feel, when fresh; bald; reddish brown to brown, fading to cinnamon.<br /> Gills: Narrowly attached to the stem or nearly free from it; close; short-gills frequent; whitish; often developing finely jagged edges.<br /> Stem: 3–8 cm long; and 1–2 cm thick; usually slightly to moderately club-shaped; moist or dry; bald; whiti
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