Boletus durhamensis is a species of bolete fungus that typically grows 3-8 cm in cap diameter, with a reddish-brown to dark brown cap and yellow to olive pores. The stem is usually 4-10 cm long and 1-3 cm thick, with a reticulate pattern. In East and Central Texas, it has been found in association with oak and pine trees, particularly in sandy or clay soils. Fruitings typically occur from May to October, with peak activity during the summer months. Specimens have been collected in various counties, including Brazos, Grimes, and Houston, often in wooded areas or along forest edges.
Mushrooms Boletus durhamensis (color of a cap changes firstly to orange-brown in KOH, then after 5 minutes it bleaches to yellow-brown, and finally to yellowish white) near Pole Creek on North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, September 26, 2024 Lone Star Hiking Trail, Montgomery County, Texas, United States
Top view of a mushroom Boletus durhamensis near Pole Creek on North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, September 26, 2024 Lone Star Hiking Trail, Montgomery County, Texas, United States
Mushrooms Boletus durhamensis (taste is not bitter, spore print is light brown, spore size is 9.1 - 10.5 x 3.5 - 4 micron) near Pole Creek on North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, September 26, 2024 Lone Star Hiking Trail, Montgomery County, Texas, United States
Mature and young mushrooms Boletus durhamensis near Pole Creek on North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, September 26, 2024 Lone Star Hiking Trail, Montgomery County, Texas, United States
Close-up of pore surface of a mushroom Boletus durhamensis near Pole Creek on North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, September 26, 2024 Lone Star Hiking Trail, Montgomery County, Texas, United States
Side view of mushrooms Boletus durhamensis near Pole Creek on North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, September 26, 2024 Lone Star Hiking Trail, Montgomery County, Texas, United States
Mushrooms Boletus durhamensis with their section near Pole Creek on North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, September 26, 2024 Lone Star Hiking Trail, Montgomery County, Texas, United States
Brown velvety caps of mushrooms Boletus durhamensis near Pole Creek on North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, September 26, 2024 Lone Star Hiking Trail, Montgomery County, Texas, United States
Underside of a mushroom Boletus durhamensis near Pole Creek on North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, September 26, 2024 Lone Star Hiking Trail, Montgomery County, Texas, United States
Pore surface of a mushroom Boletus durhamensis near Pole Creek on North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, September 26, 2024 Lone Star Hiking Trail, Montgomery County, Texas, United States
Young mushrooms Boletus durhamensis near Pole Creek on North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, September 26, 2024 Lone Star Hiking Trail, Montgomery County, Texas, United States
Spores (in KOH) of mushrooms Boletus durhamensis collected from Sam Houston National Forest north from Montgomery. Texas, September 26, 2024 Spore size 9.1 - 10.5 × 3.5 - 4 µm, length to width ratio Q = 2.4 - 2.8.
Spores (in lugol) of mushrooms Boletus durhamensis collected from Sam Houston National Forest north from Montgomery. Texas, September 26, 2024
Spores (in mixture of Melzer and lugol) of mushrooms Boletus durhamensis collected two days before near Pole Creek on North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, September 28, 2024
Spores (in lugol) of mushrooms Boletus durhamensis collected two days before near Pole Creek on North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, September 28, 2024
AI-generated summary of observations
Mushrooms of Boletus durhamensis were observed near Pole Creek in the Sam Houston National Forest, Texas, on September 26, 2024. The cap color changed when treated with KOH, initially turning orange-brown, then bleaching to yellow-brown, and finally to yellowish white. The mushrooms had a non-bitter taste, light brown spore print, and spores measuring 9.1-10.5 x 3.5-4 microns. Observations included mature and young specimens, with brown velvety caps and pore surfaces. Spore characteristics were also examined using various reagents, including KOH, lugol, and a mixture of Melzer and lugol. The mushrooms were found in the Little Lake Creek Wilderness area, specifically on the North Wilderness Trail, providing insights into their habitat and morphology in East and Central Texas.