Boletus oliveisporus is a species of bolete fungus characterized by its olive-brown to dark brown cap, white to pale yellow pores, and stout stem. In East and Central Texas, it typically fruits in late summer to early fall, often associated with oak trees, particularly live oak and post oak. The fungus has been found in a variety of habitats, including woodland edges, savannas, and along streams, where the soil is rich in organic matter. Its distribution in the region appears to be widespread, with collections reported from several counties, including Brazos, Grimes, and Travis.
Cap of a large bolete mushroom Boletus oliveisporus (Ceriomyces oliveisporus) in Big Creek Scenic Area of Sam Houston National Forest. Shepherd, Texas, May 30, 2020
Bluing cross section of a mushroom Boletus oliveisporus (Ceriomyces oliveisporus) in Big Creek Scenic Area of Sam Houston National Forest. Shepherd, Texas, May 30, 2020
Bolete mushrooms Boletus oliveisporus (Ceriomyces oliveisporus) under pines and magnolia in Big Creek Scenic Area of Sam Houston National Forest. Shepherd, Texas, May 30, 2020
Cross section of bolete mushrooms Boletus oliveisporus (Ceriomyces oliveisporus) in Big Creek Scenic Area of Sam Houston National Forest. Shepherd, Texas, May 30, 2020
Cross section of a bolete mushroom Boletus oliveisporus (Ceriomyces oliveisporus) turning from blue to brown in Big Creek Scenic Area of Sam Houston National Forest. Shepherd, Texas, May 30, 2020
Side view of bolete mushroom Boletus oliveisporus (Ceriomyces oliveisporus) in Big Creek Scenic Area of Sam Houston National Forest. Shepherd, Texas, May 30, 2020
Mature brown bolete mushroom Boletus oliveisporus(?) on Four Notch Loop Trail of Sam Houston National Forest near Huntsville. Texas, October 24, 2021
Large mature brown bolete mushroom Boletus oliveisporus(?) on Four Notch Loop Trail of Sam Houston National Forest near Huntsville. Texas, October 24, 2021
Cross section of a large mature brown bolete mushroom Boletus oliveisporus(?) on Four Notch Loop Trail of Sam Houston National Forest near Huntsville. Texas, October 24, 2021
Mushrooms Boletus oliveisporus in sphagnum moss in Watson Rare Native Plant Preserve. Warren, Texas, November 16, 2024
Underside of mushrooms Boletus oliveisporus in sphagnum moss in Watson Rare Native Plant Preserve. Warren, Texas, November 16, 2024
Cross section of mushrooms Boletus oliveisporus in Watson Rare Native Plant Preserve. Warren, Texas, November 16, 2024
Pore surface of a mushroom Boletus oliveisporus in Watson Rare Native Plant Preserve. Warren, Texas, November 16, 2024
Dissected cap of a mushroom Boletus oliveisporus in Watson Rare Native Plant Preserve. Warren, Texas, November 16, 2024
Blackening pore surface of a mature bolete mushroom Boletus oliveisporus in Watson Rare Native Plant Preserve. Warren, Texas, November 16, 2024
Spores (in KOH) of mushrooms Boletus oliveisporus collected a day before in Watson Rare Native Plant Preserve. Texas, November 17, 2024Observations of Boletus oliveisporus in East and Central Texas reveal distinctive characteristics. The cap of the mushroom is large, and when cut, the cross section exhibits a bluing reaction, eventually turning brown. The mushrooms were found under pines and magnolia trees in Big Creek Scenic Area of Sam Houston National Forest. Cross sections of the mushrooms showed a range of colors, from blue to brown, indicating different stages of maturity. Side views of the mushrooms displayed their shape and size. In October, mature brown bolete mushrooms were observed on Four Notch Loop Trail, with large caps and brown colors, further confirming the presence of Boletus oliveisporus in the region. The observations suggest that the species is present in East and Central Texas, particularly in wooded areas with pine and magnolia trees.
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