Synonyms: Agaricus asemus, Agaricus bibulosus, Agaricus butyraceus, Agaricus leiopus, Agaricus spongiosus, Collybia asema, Collybia aurorea, Collybia bibulosa, Collybia butyracea, Collybia ephippium, Marasmius asemus, Marasmius butyraceus.
Common names: butter cap, Buttery Collybia.
Extract from Wikipedia article: Rhodocollybia butyracea, common name Buttery Collybia, is a species of fungus in the mushroom family Marasmiaceae.
Finnish: Valkoviirujuurekas, German: Butter-Rübling, Hungarian: Bunkóslábú fülőke, Lithuanian: Sviestinė plempė, Polish: Monetnica maślana, Russian: Коллибия масляная, Swedish: Mörk nagelskivling, Ukrainian: Родоколібія масляна.
Rhodocollybia butyracea is a small to medium-sized mushroom with a buttery or creamy cap that ranges in color from yellowish to pinkish-brown, often with a darker center. The gills are crowded and pale yellow to cream-colored. It typically grows in clusters on the ground in wooded areas, especially under oak and pine trees. In East and Central Texas, it is commonly found in the fall season, particularly in October and November, in a variety of habitats including deciduous and mixed forests. The fungus tends to prefer moist, rich soils and can be abundant in areas with an abundance of leaf litter.
Butter cap mushrooms (Rhodocollybia butyracea) in Lick Creek Park. College Station, Texas, November 9, 2018
Butter cap mushrooms (Rhodocollybia butyracea) in Lick Creek Park. College Station, Texas, November 9, 2018
Butter cap mushrooms (Rhodocollybia butyracea) on Lone Star Hiking Trail near Pole Creek in Sam Houston National Forest. Richards, Texas, December 12, 2020
Jagged gills of butter cap mushrooms (Rhodocollybia butyracea) on Lone Star Hiking Trail near Pole Creek in Sam Houston National Forest. Richards, Texas, December 12, 2020
Butter cap mushrooms (Rhodocollybia butyracea) under small oaks in Lick Creek Park. College Station, Texas, December 23, 2020
Butter cap mushrooms (Rhodocollybia butyracea) under small oaks in Lick Creek Park. College Station, Texas, January 21, 2021
Side view of butter cap mushrooms (Rhodocollybia butyracea) under small oaks in Lick Creek Park. College Station, Texas, January 21, 2021
Gills of butter cap mushrooms (Rhodocollybia butyracea) under small oaks in Lick Creek Park. College Station, Texas, January 21, 2021
Underside of butter cap mushrooms (Rhodocollybia butyracea) under small oaks in Lick Creek Park. College Station, Texas, January 21, 2021
Butter cap mushrooms (Rhodocollybia butyracea) among pine needles on North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, November 14, 2021
Butter cap mushrooms (Rhodocollybia butyracea) in Little Thicket Nature Sanctuary. Cleveland, Texas, April 22, 2023Observations of Rhodocollybia butyracea in East and Central Texas show that the fungus grows in various environments. In Lick Creek Park, College Station, it was found under small oaks on multiple occasions (November 9, 2018, December 23, 2020, January 21, 2021). The mushrooms were also spotted in Sam Houston National Forest, specifically on Lone Star Hiking Trail near Pole Creek (December 12, 2020) and among pine needles on North Wilderness Trail (November 14, 2021). Additionally, they were found in Little Thicket Nature Sanctuary, Cleveland (April 22, 2023). The observations suggest that Rhodocollybia butyracea can thrive in different habitats, including oak and pine environments, and can be present throughout the year, with sightings recorded from November to April. The fungus's jagged gills were also noted in some observations.
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