(20 votes, average: 3.95 out of 5)
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Rooting Bolete
Inedible 
Autumn 
Summer 
The Rooting Bolete, Caloboletus radicans.
Although not poisonous this mushroom is so bitter it will ruin any dish you put it in.
| Mushroom Type | |
| Common Names | Rooting Bolete (EN), Cap Tyllog Gwreiddiog (CY), Gorzkoborowik Korzeniasty (PL), Kesernyés Tinóru (HU) |
| Scientific Name | Boletus / Caloboletus radicans |
| Synonyms | Boletus albidus |
| Season Start | Aug |
| Season End | Oct |
| Average Mushroom height (CM) | 10 |
| Average Cap width (CM) | 20 |
Please note that each and every mushroom you come across may vary in appearance to these photos.
Cap
Off white to grey/brown, darkening with age. Can get very big and uneven and will show cracking on the surface of the cap.
Pores
Does not have gills but lemon yellow, tight, sponge like pores which bruise blue.
Stem
Lemon yellow at the top becoming pale red or brown and ‘dirtier’ towards the swollen, slightly rooting base. The stem has a light coloured mesh which is best seen towards the top.
Flesh
Yellow when first cut but quickly changing to off white in the cap and then turning blue.
Habitat
Usually with oak and beech but will grow with other deciduous trees.
Possible Confusion
Other Boletes, particularly Bitter Beech Bolete (Caloboletus calopus), pictured.
Spore Print
Olive/brown. Subfusiform.
Taste / Smell
Bitter.
4 comments for Rooting Bolete
Very pretty fungus, seen in profusion in a Sheffield park.
They’re hanging around in mid Norfolk quite profusely too. Such a shame they’re not edible.
I have found a few of these but i have also found ones that are less destinct and could be Butter/Oak Boletes ( Butyriboletus appendiculatus).
Both stain blue with red at the bottom of the stem and have yellow pores. I tasted a small amount of flesh and it was not bitter at all.
Is there a definative way to tell the difference between these two species?
The Rooting Bolete has bitter flesh.