Russula mutabilis is a species of mushroom characterized by its cap that ranges from yellow to orange to reddish-brown, often with greenish or bluish tints, and measures 3-8 cm in diameter. The gills are crowded, white to cream-colored, and the stem is white, stout, and up to 6 cm long. In East and Central Texas, Russula mutabilis typically fruits from June to October, often in association with oak and pine trees. It can be found in a variety of habitats, including woodland edges, clearings, and along roadsides. The fungus is considered edible, but its quality is variable and it may cause gastrointestinal upset in some individuals.
Brittlegill mushrooms Russula mutabilis turning yellow and brown on floodplain on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest, near Huntsville. Texas, July 7, 2018
Gyroporus ballouii (Tylopilus balloui) together with Russula mutabilis mushrooms on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest, near Huntsville. Texas, July 7, 2018
Dissected brittlegill mushrooms Russula mutabilis on floodplain on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest, near Huntsville. Texas, July 7, 2018
Foetid brittlegill mushroom Russula mutabilis on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, July 13, 2018
Foetid brittlegill mushroom Russula mutabilis in cross section on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, July 13, 2018
Dissected foetid brittlegill mushroom Russula mutabilis on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, July 13, 2018
Dissected brittlegill mushrooms Russula mutabilis(?) in Lick Creek Park. College Station, Texas, May 26, 2020
Brittlegill mushrooms Russula mutabilis in Lick Creek Park. College Station, Texas, September 23, 2020
Cross section of brittlegill mushrooms Russula mutabilis in Lick Creek Park. College Station, Texas, September 23, 2020
Russula mutabilis and Helvella mushroom with fungus Hypomyces cervinus on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, November 7, 2021
Brittlegill mushroom Russula mutabilis(?) under post oaks in Lick Creek Park. College Station, Texas, May 13, 2022
Brittlegill mushrooms Russula mutabilis on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, September 4, 2022
Brittlegill mushrooms Russula mutabilis under oaks in Lick Creek Park. College Station, Texas, May 13, 2024In East and Central Texas, observations of the fungus Russula mutabilis were recorded in various locations, including Sam Houston National Forest and Lick Creek Park. The mushrooms were found to turn yellow and brown on floodplains, particularly on Caney Creek Trail. They were often discovered alongside other species, such as Gyroporus ballouii and Helvella mushroom with fungus Hypomyces cervinus. Dissections of the mushrooms revealed their internal structure. Russula mutabilis was observed in different months, including July, May, June, September, and November, suggesting a wide range of fruiting periods. The mushrooms were typically found under oak trees, including post oaks, in wooded areas. Observations spanned several years, from 2018 to 2024, providing insight into the fungus's presence and habits in the region.
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