Recognize Neoboletus luridiformis by its red to orange-red pore surface under the cap, a stout yellow stem densely covered with fine red dots, and flesh that bruises deep blue almost at once when cut or pressed.
The cap is usually 2 to 8 inches (5 to 20 cm) wide, with pores replacing gills.
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Check the cap, pore surface, and stem pattern first.
A clear view of the red pores and dotted yellow stem is especially useful.
This bolete shows clear visual changes as the fruiting body expands and ages.
A few red-pored boletes are regularly confused with Scarletina Bolete.
lurid bolete(Suillellus luridus)
Both bruise blue and have orange to red pores. Suillellus luridus usually shows a clear netlike pattern on the upper stem, while Neoboletus luridiformis is typically dotted rather than netted.
bitter beech bolete(Caloboletus calopus)
It can share a pale cap, yellow pores that redden with age, and a red-toned stem. The stem is strongly netted, not dotted, and the cap is often much paler overall.
deceiving bolete(Suillellus queletii)
This species also has red pores and blue bruising. It is usually more slender, and the stem lacks the dense red dotting typical of Neoboletus luridiformis.
Neoboletus luridiformis is native across much of Europe and also occurs in parts of temperate Asia. It is most often found in broadleaf or mixed woodland, especially with beech and oak, and sometimes with conifers. For identification, habitat is useful because this bolete is typically a forest species rather than a grassland or wetland mushroom. Finding it on the ground in established woodland helps narrow the match, especially in acidic to neutral forest settings.
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The quickest field mark is the strong blue bruising on the yellow pore surface and flesh, combined with a dark brown cap and a stout stem covered in red dots rather than a net-like pattern.
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