10 September 2020 Berkshire. Photograph copyright Leif Goodwin. Synonymns Boletus porosporus Cap Convex, expanding with age, brown, felty when young, becoming smooth with age and cracking to reveal whitish flesh beneath, to about 7.5 cm across Pores Lemon yellow when young, becoming greenish yellow with age, large, angular, turning blue when bruised Stem Cylindrical to club shaped, finely lined, lemon yellow at the apex sometimes with a bright red band beneath, brown below, mycelium at the base white Flesh Soft and lemon yellow in the cap and stem apex, fibrous and brownish in the rest of the stem, not turning blue when bruised Smell Fungal, somewhat unpleasant Taste Fungal, somewhat unpleasant Season Summer to autumn Distribution Frequent Habitat In broadleaf woods, favouring oak Spore Print Olive brown Microscopic Features Spores spindle shaped, smooth, truncate at one end (12-17) x (4.5-6.5) µm2 Edibility Edible, poor Notes This species is easily recognised by the truncate spores 
Spores in Melzer's solution viewed with a x100 immersion objective. 10 September 2020 Berkshire. Photograph copyright Leif Goodwin. |